Where I live the epoxy is very difficult to come by. Lots of folks are getting excellent results with the water based poly. After reading a lot about glassing with poly and painting with latex I gave it a shot.

I glassed with poly on foam and it gave fantastic results. Light and smooth as can be. Not as beefy as glassing with epoxy but I didnt need the extra strength, just a good surface to paint.

The foam doesnt soak up the poly like balsa will. Lots of folks say to use sanding sealer first on the balsa but I cant find it here so I also read where someone had used balsarite with good results. Thats why I was surprised by its thickness. So if the balsarite is not suitable I need something that will work for sealing the balsa.