paint over it? ummm i dunno.. Goop is alot like rubbercement.. but VERY strong... i made a res with only GOOP and plexy.. it held together fine.. GOOP doesnt get real hard... it gets more like uhh... hard shoe rubber =)
http://geocities.com/xdigitalchaosx/
go there and scroll down to the bottom.. there will be a series of pics 5 rows up... you can see the res i made sitting ontop of the case... that thing ran for months before i got rid of the case.
i also used goop to seal the brass fittings on that rio.. and i do the same for the heatercores that i mod...
hell.. i even used goop to fill the pits in my Athlon Xp..
the best part about this stuff... is that you can actually peel it off (with alot of force) and thats why i used it on my XP =)
go buy a tube of it.. i guarantee you will love it