yes, very sandable and lighter weight than bondo, you mix it with the epoxy to the thickness you want.
if you go to this thread you'll see some before and after pics of a cowl repair,, the beige is the 410 filler fairing the epoxy resin/glass patching
http://www.rcgroups.com/forums/showt...7#post26123978
came out pretty nice IIDSSM
good luck