BEWARE : For those in Europe using "G4 polyurethan varnish" by SOLOPLAST (very good fuel proofing varnish) :

http://www.soloplast.fr/resultat.asp...e=39&Submit=OK

It DOES contain dipenylmethane isocyanates ! [X(][X(][X(]

I used to remember my early modeling days when I was 14, using this varnish in NON ventilated areas, with no mask at all, working with bare hands (very sticky). I 'm still here today, 15 years after, but perhaps not for long, go figure.
Take care.