TWO PART EPOXY PAINT (coal tar epoxy)

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Coal Tar Epoxy Paint Info Page

 

Coal tar epoxy paints are essentially a mix of coal tar and epoxy resins (and not all epoxy resins are the same). Coal tar epoxies were at their peak of popularity in the 1960's (???) through about 1990. After that, non-coal tar epoxies replaced coal tar epoxies due largely to health concerns over long term exposure and direct contact (by coating applicators) to the ‘tar'.
 

 

AMERICAN MADE COAL TAR EPOXY

 

Coal Tar Epoxy Paint Intro & alternatives -- solvent free coal tar two part epoxy

Solvent Free Coal Tar Epoxy Paint - Commercial grade
 


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A few years ago I searched the Internet looking for information about coal tar epoxy paint. I found lots of product pages, but nothing about why and where coal tar epoxies should/could be used in place of regular epoxies. What are the Pro's and the Con's of coal tar epoxy paint? I have now learned these things and wish to share the information.

Please note that our company, Progressive Epoxy Polymers, Inc., offers a coal tar to the line of epoxies and clear coat products that we sell. It is a solvent-free coal tar epoxy of very good quality (using the most modern epoxy components to a 38% coal tar base). It sells in 2 gallon kits. More information and links to our company web site are at the end of this document. So much for the advertisement/disclaimer, now the information promised above!
 



Background History

Coal tar epoxy paints are essentially a mix of coal tar and epoxy resins (and not all epoxy resins are the same). Coal tar epoxies were at their peak of popularity in the 1960's (???) through about 1990. After that, non-coal tar epoxies replaced coal tar epoxies due largely to health concerns over long term exposure and direct contact (by coating applicators) to the ‘tar'.



Advantages of Coal Tar Epoxy Paint

Coal Tar epoxies are inexpensive compared to most non-coal tar epoxies. The offer considerably more flex (or elongation) then regular epoxies. This makes them useful on garage floors where turning/spinning tires will ‘stretch' the epoxy, as well is in situations with a lot of expansion and contraction. Coal Tar epoxies are also famous for protection from moisture, both in the water (such as barge hulls) and when buried underground (such as pipelines and underground tanks). A key advantage of coal tar epoxies is its ability to bond to oily surfaces (thanks to the hydrocarbon nature of the ‘tar').



Disadvantages of Coal Tar Epoxy Paint

Coal Tar epoxies smell like tar/asphalt and leave an asphalt like stain on your hands, etc. when working with the un-cured epoxy. It only comes in a tar black color. Coal tar is not something you want to handle on a regular basis over a long periods of time.

Most or all of the other disadvantages of coal tar epoxies are often more about the epoxy side of the mixture rather than the coal tar side. Issues here can include solvents in the product, and poor resistance to UV (becoming more brittle and chalky), are the ones that come to mind. There are also reports that weathered coal tar is difficult to recoat or topcoat. At least some coal tar epoxies appear to leave behind an oily layer as the epoxies weather away and this layer makes top coating - recoating difficult or impossible. The coal tar that we use does not appear to have this problem, at least it hasn't been reported to me yet.
 

 


Misc. Information

Coal tar epoxy paint (at least the version we sell) can be topcoated with regular paints. It can also be used with colored quartz sands or vinyl chips for decorative epoxy floors -just like non-coal tar epoxies are used.



When and Where I Would Recommend Coal Tar Epoxy Paint

The less costly coal tar epoxypaint is often a better quality coating than an equally priced non-coal tar epoxy. A good quality (and more costly) non-coal tar epoxy will perform equal or better than a coal tar epoxy and will be available in colors other than black. The odor of coal tar epoxies (at least the one we sell) is not really that strong, still, I would use it in a well ventilated area or outdoors. The coal tar epoxies that I have tried (several brands) all seemed flow of the paint brush more smoothly than solvent free, non coal tar epoxies. This makes it a bit easier to apply and probably less likely to leave behind thin spots or ‘pinholes' in the coating surface.

Because coal tar epoxies will bond better than other epoxies to oily surfaces, they are more likely to remain bonded to ‘degreased' garage or work floors. I would consider their use, perhaps thinned with solvent, as a sealer/primer over such areas. The coal tar epoxy can then be topcoated with other coatings.

The much flex (bend) and elongation (pull) of coal tar epoxies (3 to 10 times the amount of regular epoxies and the only product we carry with BOTH flex and elongation - each about 25%) ) is its greatest characteristic and the case presented regarding the benefits of this property when used on garage floors, garage ramps, etc. where there is lots of rubber tire traffic, makes logical sense to me. However, I have not heard of less flexible, non coal tar epoxies failing in these situations either. Coal tar's ability to withstand moisture (old time sailors sealed their boats with tar pitch) is another important plus, but I think good quality, non coal tar epoxies offer just as good moisture sealing.

Coal tar epoxy paints are ‘out of style' but their usefulness has not diminished. A good quality coal tar epoxy offers a price to performance ratio that is hard to beat. Their greater flex is a real plus (although not as important in may situations as it might seem), while their messy tar staining and smell are a downside consideration. I think the decision to use coal tar epoxy can be made more on personal choice than on a point by point technical comparison, sort of like decision between an apple or orange with your lunch. Just remember that all coal tar epoxies (like all other epoxies) are not the same.

coal tar epoxy


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This current page is all about:

TWO PART EPOXY PAINT

Coal Tar Epoxy Paint Intro & alternatives -- solvent free coal tar two part epoxy

Solvent Free Coal Tar Epoxy Paint - Commercial grade
 


solvent free coal tar epoxy

 

Coal Tar epoxy paint alternative is our black CM 15 epoxy paint - find both Coal Tar and CM 15 in our catalog - CLICK HERE


Our solvent free coal tar epoxy was used below the waterline and on many metal fittings on the 24 meter long, 3 masted pre-1840 Barkentine being build by App Applegate - Click Here for pictures, info, etc.

All coal tar epoxy paints are not the same!


Materials Performance magazine dec. 2002 - q&a section page 39

"Coal tar epoxy paint failure"

RE: coal tar coating failure in a sewer pump station steel wet well. After suitable surface preparation surface was coated with two coats of a polyamide coal tar epoxy. Failure of the coating was at a 5 inch zone at the top of the high liquid level. Failure consisted of softening and swelling, not blistering. The authors go on to quote from "Corrosion Prevention by Protective Coatings," a text by C.G. Munger. Munger states that CTE (coal tar epoxies) coatings are most effective in the sewage industry. However he qualifies this by stating that the amine cured CTE system is essential because of the bacterial attack on the polyamide curing agent.

The coal tar epoxy paint offered by Progressive Epoxy Polymers IS an AMINE cured system and not the problem causing amide system described above. Our coal tar epoxy is also solvent free (0% VOC).

 

This is not your Grandfather's Coal Tar epoxy! It is a very high end, solvent free, cycloaliphatic based epoxy system coal tar epoxy

 

CLASSIFICATION PROFESSIONAL QUALITY "B GRADE" MAINTENANCE COATING - THIS IS A HIGH QUALITY COAL TAR EPOXY
% VOC 0% VOC, 100% SOLIDS
SHIPPING/EXPORTING HAZMAT - ORM-D TO SHIP. CANNOT BE SHIPPED OUTSIDE THE USA OR BY AIR
VISCOSITY BRUSHABLE, ROLLABLE
STND COLORS BLACK
WET APPLICATION APPLIED TO DRY SURFACES
MIX RATIO 1 TO 1 BY VOLUME
STND PACKAGING STANDARD PACKAGING IS 2 GALLON UNIT
MISC. INFO  
PRIMING  
   
   
   
   
   

 

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COAL TAR EPOXY

Daniel Skira -- Skira Yacht Design wrote (5/2010):

I just received my two quart of coal tar epoxy I ordered. What I really like is the literature and all the information you put with the package. It is very useful. I used normal coal tar until now, and look forward to try your product.



VENDOR COMMENTS:

Hi Daniel – Thanks for the kind words. Yes, I too like the coal tar epoxy - rolls on nicely. But coal tar epoxies have other issues (see www.epoxyproducts.com/coaltar.html - soft/flexible, may not be able to paint over especially if old and sun weathered, etc.) and I often recommend cm 15 epoxy as an alternative to the coal tar.

If you notice a difference with our coal tar epoxy it would be because of the high end epoxy part of the coal tar epoxy we use. Most coal tar epoxies have a reputation for using very low end epoxy.


Daniel Skira -- Skira Yacht Design wrote (5/2010):

Paul, – The one to one mix is absolutely the way to go. Fantastically easy. The product is very good, goes like a charm on wood, dry nicely without any shrinkage. I built the boat outside, at 50F no problem even we had light rain, no problems.

I really like your coal tar epoxy. A real time saver compared to the classic one. The quality of the coal tar is the same as the high end one component I used for almost 30 years. But yours dries! No need to wait one month anymore! No need to boil it either like the other one, to have a good penetration. Your coal tar epoxy seams to have a very good penetration. I even used on some larges holes on the keel, and it worked like a charm. Impossible to do the same with the non-epoxy one. I will be sending another order. I am hooked on yours! I will probably paint the underwater part of the hull with your coal tar epoxy. Many thanks.


Daniel Skira -- Skira Yacht Design wrote (5/2010):

Hi Paul – Just painted with regular oil based painting on top of your coal tar epoxy without any preparation. Dry neat, and seems to bond. I sanded two coats of coal tar epoxy with a belt sander and 36 grit belt, but with a light handling of the machine. Perfect, no problems. Painted on top with regular oil based paint. No problem.

So my underwater hull will be painted with your coal tar epoxy. Then I will apply a coat of antifouling. Not the sides since I know the problem of epoxy and the sunshine. The elongation of you coal tar is a perfect match for my wooden hull.
All my best. - > Daniel


Daniel Skira -- Skira Yacht Design wrote (5/2010):

Hi Paul – After curing for 7 days, the coal tar epoxy I applied to a steel bar was even not touched. I used a heavy hammer to bend the steel bar. The secret is let it cure at least 7 days and it is hard and flexible. It is the greatest coal tar epoxy I ever tried. You can post my trial on your website. This an amazing product. But I repeat, the curing time is mandatory. Sometime people think epoxy is immediate, they are wrong. I will come for more, the hull will be primed underwater with your coal tar epoxy.
All my best – Daniel

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TWO PART EPOXY PAINTS - SOME CAN EVEN BY APPLIED UNDERWATER

These are high end epoxy paints with years of commercial and industrial history - now available in smaller units for smaller projects and DIY activities

 

epoxy paint

Used on tanks, pits, sumps, foundations, boat hulls etc.

 

Corro Coat FC 2100 A 

The only Epoxy Paint reinforced with Kevlar (tm) microfibers and feldspar ceramic for an incredible hard and tough product plus enhanced abrasion resistance. You will not find a better epoxy paint for your tough, demanding project. Non hazmat to ship - so flies anywhere you need it.  This super performance epoxy has its own web page - FC2100.

 

Can be applied Underwater too! Nothing else like it in the market. Manhole and tank lining system.

 

Water Gard 300™

High end end, solvent free epoxy paint available in blue or white. This version has a little bit of flex to it. - 2 to 1 mix ratio. Can be applied underwater (ie. spa and swimming pool repair). Manhole and tank lining system. A very popular marine barrier coat epoxy. - potable water version is NSP `120 (below). Learn more.

epoxy paint

Water Gard 300 coating a boat bilge

before and after pictures

NSP 120

A potable water version of the Water Gard 300 solvent free epoxy paint available in blue or white. This version has a little bit of flex to it. - 2 to 1 mix ratio.  Approved for tanks over 800 gallons. Learn more.

 

Coal Tar epoxy paint   

A very high quality, solvent free, black coal tar epoxy. This version has a little bit of flex to it. - 1 to 1 mix ratio. Only found in our industrial catalog. This is the GOOD coal tar epoxy - Learn about coal tar epoxies.

6/16/10

Hello Paul,

I own a 1986 Hunter Legend 40 sailboat. I bought the boat in the fall of 2004 and had the hull below the waterline was sandblasted in the spring of 2005. The hull was then coated by the boat yard with a VC-Tar coal tar epoxy at great expense. by the fall of 2005, barely 5 months later, the hull started showing signs of osmosis again below the waterline. This was likely due to the very thin coat of coal tar applied by the boat yard.

In the spring of 2006 I proceeded to sand off the VC-Tar from the entire hull and applied five coats your coal tar expoxy. Once dry, I applied a hard antifouling paint. The coal tar has held up beautifully and is still in good condition after 5 years. The osmosis has not resurfaced, indicating that the coal tar is doing its job as a barrier coat.

My only dissapointment is that the curing time can be lengthy and if you apply antifouling paint over the coal tar before it is fully cured, the paint will craze. That said, I have since sanded the antifouling paint off and subsequent paint coatings hold up well on the rougher surface.

Regards, Fulvio

 

CM 15

A top quality solvent based epoxy paint with extremely long pot life and plenty of flex (unlike most brittle epoxy paints). Used as an epoxy paint/barrier coat and places where good flex is required (often over wood)

 

find these epoxy paints in our COMMERCIAL - DIY CATALOG

find these epoxy paints in our MARINE CATALOG

 

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Coal Tar Epoxy Paint Intro & alternatives -- solvent free coal tar two part epoxy

Solvent Free Coal Tar Epoxy Paint - Commercial grade
 

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