Does anyone have any experience using water-based Polyutherene clear as a final coat over latex paint. Will water-based Polyutherene turn latex white paint yellow over time, and is this ok to use for gas planes. Any info would greatly help.
Thanks

I have used mineral base poly over latex white and it does yellow somewhat. The water base varathane diamond does not yellow but is not as fuel proof for glow fuel. Get a spray can of the diamond finish and try it with gas. All poly takes at least a couple of weeks to really cure.

Does anyone have any experience using water-based Polyutherene clear as a final coat over latex paint. Will water-based Polyutherene turn latex white paint yellow over time, and is this ok to use for gas planes. Any info would greatly help.
Thanks

I have used Minwax Polycrylic over latex.

It does not yellow with age.

Water base poly is fuel RESISTANT WITH THE FOLLOWING CAVEATS: 1. Let the poly dry for a minimum of 7 days before exposing to glow fuel. 2. Do not let the exhaust residue remain on the plane over 4 hours. After 4 hours the poly begins to soften up and get "gummy".

For gas planes (gasoline fuel) the latex is normally fine as is.

I use flat latex for my painting (occasionally semi-gloss) and control the degree of "shine" I want with the poly clearcoat. My warbirds typically get a satin, while my other planes will get semi-gloss or gloss depending on the plane. Be advised - latex and a clearcoat IS NOT going to give you a Mokokote type shine.

I 've been using latex for about 6 years
and I agree with Campy 100%.

I'll add this little tidbit of information about an
experiment that I did last year when I replaced
a canopy on my 4*120.


FWIW:
Last winter,after 5 years ,the canopy finally needed to be replaced.
So I removed the old one , lightly sanded the deck between the
firewall and canopy area,brushed on a new coat of gloss latex,
let it dry for several days, and then applied the new canopy.
I was going to clear coat the new paint but decided not to do so
since the plane has been wiped down so many times I'm sure
that no more clear coat exist anywhere.

That was some ten months ago and the deck still looks like the
day I painted it and I know that 15% fuel has gotten on it from
time to time.

I'm just starting to paint my TF Stinson with latex but I "might" just skip
the clear coat this time around . At this point my opinion is that the
clear coat might be more for gloss factor than protection.

I haven't made a firm decision yet.

Regards
Roby

Thanks for all the info guys.