Originally Posted by
crazybillybob
Drywall Joint compound. Comes premixed and you get 5 Gal for cheap. You can buy a bucket of pre mixed and if it's too thin, add some of the dry mix type. It shapes and sands well. Plus it will handle the heat (some people use it in lost wax\foam metal casting as an outer coating on the foam....better surface finish). Plus you don't have all the toxic vapors like with bondo.....Downside is you've gotta make sure it's good and dry or you may have steam issues (not likely but could happen). Also use wood or other materal to be the bulk of the buck, only the outer 1/2" or so needs to be filler.
Good man!
Crazybillybob