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Registered Member #1732
Joined: Thu Oct 02 2008, 02:34PM
Location: Huntsville, AL
Posts: 112
Dr. Spark wrote ...
Actually I have and even done hybrids. Epoxy is not 100% as have seen nightmares unfold and once cured it’s a mess. Even seen epoxy not cure right and was sticky to the touch for six months. Have sanded down the epoxy and put a coat of ploy on top; however, there tends to be small bubbles that refract in the light with epoxy.
As with many things there is a bit of a learning curve to get past with epoxy. If it's applied with the proper technique the results will be almost indistinguishable from a quality polyurethane coating. These problems you mention with epoxy are just the result of improper application. The stickiness is a result of either improper mixing, or not enough harder being added to the resin. Bubbles can be mitigated, if not eliminated completely by proper selection of epoxy, or vacuum degassing (as I did in my video). As to epoxy being a mess after it's cured ... it certainly does make mess on whatever it pours onto, but that's why you just lay down something to protect the surface under the coil.
I've always been a fan of your work, and your results are simply amazing. I personally have excellent results with epoxy using my process -- I think it's all just a matter of what you're used to.
Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
Phillip Slawinski wrote ...
As with many things there is a bit of a learning curve to get past with epoxy. If it's applied with the proper technique the results will be almost indistinguishable from a quality polyurethane coating. These problems you mention with epoxy are just the result of improper application. The stickiness is a result of either improper mixing, or not enough harder being added to the resin. Bubbles can be mitigated, if not eliminated completely by proper selection of epoxy, or vacuum degassing (as I did in my video). As to epoxy being a mess after it's cured ... it certainly does make mess on whatever it pours onto, but that's why you just lay down something to protect the surface under the coil.
Epoxy is tricky to deal with. I have some experience in making composite components for our Euro LSA aircraft project ( )
From my experience several things can cause problems with epoxy being left soft or tacky. Usually its not all the way through but only surface defect that is caused by amines that form as byproduct when epoxy cures in less than ideal conditions.
These things are: - Mixing ratio (5:2 in volume or 3:1 in weight). I use mixing scale and mix my batches to less than 1 gram tolerance - Actual mixing time. When you think your epoxy is mixed enough and your hand hurts, mix it some more. - Temperature. Too cold is worse than too hot, but stay within recommended temperatures during mixing and curing - Humidity. High humidity is not ideal either.
This tacky amide residue can be removed by just washing it off with warm soap water and mild scrubbing. Amines do not dissolve in solvents like acetone and trying to sand those off without cleaning first will just drive the remaining amines deeper to the epoxy!
Epoxy is not like the polyester body fillers or polyester resins where you can just judge the mixing ratio by eye and call it good
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Epoxy Coating Tutorial Video
