Can't answer your questions regarding long term effect. I just finished painting my Chesapeake 17 and I used the red auto body filler under (and even between coats) of Interlux Brightsides. No visible problems yet - all appears evenly dried etc. We'll see soon how it works on the water.

Mark

> Has anyone used red nitrogen putty (auto body type) to fair small
> imperfections before painting. I have grown tired of the endless cycle
> of filling and sanding using epoxy, but would like to paint to a very
> glossy finish. I'm using MAS non-blush epoxy, Interlux Brightsides
> one-part polyurethane paint with Interlux primer. The nitro putty
> is cheap, dries fast, fills small imperfections well and sands easily
> (on cars anyway). Will the paint (primer) adhere? Is it too soft?
> Any other problems?