Quote from: kevin king on July 22, 2020, 09:08:19 PM

I use dope on my large models, and since my 1/2a uses 30% nitromethane I decided to try 2 part urethane instead of dope. I think I should have just stayed with dope  because the 2 part automotive urethane wrinkled from the fuel. I can't remember any of my dope finished 1/2a high nitro fuels wrinkling my finish. So now I have a gallon of 2k automotive clear on Kjiji.

Wrinkling?

Interesting.

I've only used it for decades and I never had an issue.

READ THE CAN, as most professionals do when they use a brand or product for the first time.

Don't over-reduce. I haven't used a mix in years because I'm an aerosol can guy, but I kinda remember to not reduce over 10%, unless things have changed?

I wish I could offer more, but I'm sure there are others who mix this who may be of more help.

How did you fix the wrinkling?

Hey Charles. Ya, I originaly went to the auto body supply store thinking they would have the 2k Spray Max aerosol cans you use. Apparently they are not available in Canada, or so he says. For the paint he sold me, I did follow the manufactures instructions for mixing to a tee. 4 parts clear to 1 part catalyst. No reducer. That low amount of catalyst is the first red flag. Usually the low catalyst content is an indicator of low quality. I guess that's why the manufactures say it's not compatable over dope. Also I suspect the finishing resin I used to glass the nose. I've always found that paint doesn't like to stick to it, unless you sand it with 100 grit sand paper and use a primer, which I didn't do. Anyway, I just sanded the wrinkled paint off, brushed on the colored dope, and finished it by brushing clear dope on it. Will see how that works. It's no big deal to me. It's just a 1/2a Skyray I built waiting for the Spitfires paint to dry before I buff it.