Good fuel proofer?

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Doc J

New member
Oct 7, 2018
Hi Lads - I am taking a break from designing gliders and I'm doing a control line F2b stunt model - of my own design needless to say.

Thing is I have been away fro it for so long I'm out of touch.

Soooo...can any of you more knowledgeable chaps point me ago a good clear coat fuel proofer? I'll be using 10% nitro so it needs to be a good one.

Any help grateful received!

Couple of pics of the drawings etc below.

Cheers and thanks - Doc J.



Well-known member
Jan 23, 2018
San Francisco
I've found that only catalized epoxy really is fuel proof, like to 65%. There are other finished that hold up fine up to 15% nitro. 2-stage urethanes like DuPont Nason works great, so does Klass Kote but a bit $$$. Non- catalized Urethanes are poor and leave a yellow tint.

If starting from scratch the classic butyrate dope over a few layers of nitrate dope should hold up fine against 10% nitro. I think Butyrate dope will hold up to 25% nitro. But it needs the teeths of nitrate dope underneath. I wouldn't use any of the dopes as a clear coat.

If clear coating don't forget to draw panel lines, real old school!


New member
Jan 23, 2018
Rockwell, IA
I've found the automotive urethane paint to be "more than enough " fuel proof unless you run 30%+ nitro. I use house brand paint and have had no problems.



New member
Feb 26, 2018
I have used Minwax polyurethane spray from the can. The new version of spray does not yellow. I left it to cure for a couple of weeks before exposing to glow fuel. I have not flown the plane enough to determine long term wear. But so far after 8 flights no problem.


New member
Jan 23, 2018
I use finishing epoxy mixed with 50% alcohol and brush it on. For firewalls, I first paint it with craft paint with a matching color and then finish it with the above mixture.