ORIGINAL: 3drc tim
I am curious about which brand of urethane clear you "know" doesn't yellow. I need to clear a H-9 white Super Cub that had been Scotch guarded and was still black on the bottom of the bird--nothing that acetone and a few hours doesn't cure--yech. Many posts I have read complain about urethane clear turning yellow in 3-6 months, especially over white!
While I have not tested for nitro protection, some have on this forum. I read awhile back that some urethane clears are good to 15% nitro, if you don't pour the raw fuel on the paint.
>My experience with Minwax Polycrylic clear has been that it does
>not yellow with age (the oil base does yellow), HOWEVER, the
>Minwax Polycrylic (waterbase poly ) is FUEL RESISTANT, not fuel
>By fuel resistant I mean that if you let it sit for at least 7
>days before exposing it to fuel AND clean your planes at the end
>of the day you will be OK. If you let the residue sit on the plane
>for much over 5 hours the clear coat will start to soften, but will
>harden up after cleaning (give it a day or 2 to reharden).
>I use 15% nitro and have had no problems as long as I do as
>If you want FUEL PROOF, you need to use any of the following:
>Automotive 2 part clear coat
Roby, thanks for the advise on the exterior vs interior; I just didn't know the difference.
>Another thing you may not be aware of is that flat latex takes
>7 - 10 days to cure while semi-gloss and gloss latex take
>14 - 21 days to cure with gloss occasionally taking longer than
>21 days for curing.
BTW, I just finished painting a large electric jet (large when you say electric is a relative term) 30" WS foam model with Latex paint, 3 colors. Wow, easy to spray, easy to clean-up and it laid down pretty nicely. I can't wait to start painting my new Ziroli AT-6.