Resin Painting Issue

[WheelsUp]

I have run across an issue with resin painting that I have never experienced before. When painting my parts, they are the variable ramps on a 1:32 F-4C, one of the ramps is a homogenous resin, ie. the color of the resin is consistent for the entire piece, the other has a marbeled appearance of light green and cream colored material. When painting either with solvent based acrylic or lacquer primer, the marbeled piece results in surface areas that are overly glossy and never appear to dry. This is compared to the homogenous piece which paints up exactly as every other resin part I have ever painted. It’s almost as if the paint, acrylic or lacquer, is drawing some chemical out of the resin and is taking forever forever to dry. Couple this with the fact that the overly glossy areas are obviously thicker and leave a non-uniform surface texture to the part, is very peculiar.

I have stripped all the paint from the piece, cleaned it with lacquer thinner and the results are the same. I have two sets of the variable ramps and the anomaly is the same on both pieces.

If anyone has run across this before and can assist in how to remedy this problem I would appreciate it greatly!

Thank you in advance

Edited May 30, 2020 by WheelsUp

[ericg]

Would be interested in which brand of resin it is. 
 

It sounds as though the resin has not cured and probably won’t get any better. 
 

Eric.

[BiggTim]

I hate to say it, but that sounds like it COULD be a bad resin mix. I've done that before when casting my own parts. It can happen no matter how careful one is, even to a pro using brand new resin of good quality. I am frankly not aware of a way to correct it either. Is there a way you can ask the manufacturer for a replacement part? You don't need to mention who they are here, but I would definitely suggest you contact them.

 

Tim

Edited May 30, 2020 by BiggTim

[WheelsUp]

I will give it a couple of days and see if it dries, otherwise I will try to reach out to the vendor.

[Bob MDC]

I agree with Tim the colouring looks like a bad mix, it happens.

leave the parts in a warm (not hot) dry place for a couple of days then a good clean with a solvent like isopropyl alcohol again dry then try an auto grey primer, if it's still a bit crappy as Elvis would say "Return to Vendor" 

 

Bob

 

[WheelsUp]

I will see how it sets over the next couple of days. If it’s still tacky I’ll try the alcohol trick, if that fails I’ll drop the vendor a line.

I don’t want to name the vendor as I know sometimes s#($ happens!

Thanks for all the help, I’ll post my final outcome and actions to solve the problem.

[WheelsUp]

Over 24 hours later the piece was still tacky and showed no sign of drying out. Believing the solvent in either the lacquer or solvent based acrylic paint was leeching something out of the “uncured” resin, I stripped the piece, dried it and tried coating the piece with Alclad water based Aqua Clear Gloss. The thought here was that this layer would contain no solvents and would hopefully not draw anything out of the resin. Long story short, no joy!

I will attempt to scratch build using another ramp that is all one resin type that has geometry flaws in it. Hopefully this will give me a usable piece to continue my build.

Im posting this simply to let others know that under these conditions the resin is not usable under any conditions I have tried. If you receive resin items that appear marbeled it is my suggestion you return it to obtain a replacement that is obviously a homogenous piece.

Thank you all again for your feedback :)