Here is a link to an article by Roy Vallencourt on using latex for planes http://www.modelairplanenews.com/how_to/latex1.asp

I do take exception with Mr. Vallencourt on a couple of the things he says.

My personal experience has shown that 2 sprayed coats of a water base poly is good to 10% nitro (various reports say it is good to 15% nitro ).

Mr. Vallancourt says the latex is dry in 24 hours. Again, my personal experience has shown that while it may be dry to the touch, it has not cured. It normally takes 7 - 10 days to cure. How I check to see if it is cured is to firmly press my finger on a hard spot (I use the cowl ). If a fingerprint remains, it is not cured. The fingerprint will disappear in a day or two. What MAY make the difference is that I do not use the heat gun to speed the drying. I tried that method and was not happy with the results.

The final item I disagree with Mr. Vallencourt on is the spraying pressure. He states 20 psi, give or take 5 psi. To me this means 15 - 25 psi. I have had my best results using 25 - 30 psi. Over 30 psi I tend to get some "dimpling" due to air pressure and under 25 psi I don't get the coverage per coat I like.

The article by Mr. Vallencourt is EXCELLENT and I highly recommend it to anyone interested in or considering using latex on their models. The exceptions are my own and in no way are meant to demeane or minimize Mr. Vallencourt's excellent article.