Like the topictitle says... is it possible to spray the EC epoxy gelcoat with an airgun an compressor?

other small question... do any of you guys know after how many time the gelcoat start to go tacky? is it like around 30min - 3h or 6h ....? :p (i'm used to had an other brand before and it was after around 1h, I just want to know to have a reference)

Matthieu Libeert
Founder MAT2 Composites X Sports
website: www.mat2composites.com