It may also be a primer but it will seal the surface wich I believe was the original query
Hmm, I thought the original question was whether it could be used as sanding sealer on balsa and plywood
My question is, will the MDF sealer work on balsa and ply?
Sanding sealer isn't just for sealing the surface after all, it is a grain filler.
Far better to get some cellulose sanding sealer, it does what it says on the tin
