Dewaxed shellac, like Seal Coat, works great under latex. BIN is
white pigmented dewaxed shellac, and works even better under some
colors and for exterior work.

Barry

I tried shellac sanding sealer under latex and found the latex looked ok but
chipped or rubbed off easily. The surface was so smooth that adhesion was
poor. Shellac over latex on the other hand is fine.

Terry