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Old 04-18-2006, 10:05 AM
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Join Date: Jul 2002
Location: Dutton, MT
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Default RE: covering turning yellow


Water base polyurethane is fuel RESISTANT, not fuel proof.

With water base poly you need to let it sit for a minimum of 7 days BEFORE exposing it to glow fuel.

Do not let the residue stay on the finish for more than 4 hours. After 4 hours the finish begins to soften.

As long as you follow the above caveats you will have no problems. I use the water base poly (Minwax Polycrylic) frequently and this is what I have found from experience.

Hope this helps.
I'd sure like to know what I did wrong, then. I tried it once, let it sit for 2 weeks; the Polycrylic was gummed up and ruined after the first flight. It was exposed to the exhaust of 15% for less than 15 minutes. I'll never use it for fuelproofing again, but it is great for fiberglassing.