Sanding sealer for used when lacquer going to be final finish. Levels wood surface speeds up finish film build. Not meant to be a pore or grain filler.
Wash coat nothing more than thinned shellac, varnish or poly levels wood surface and speeds up film finish build. Not meant to be a pore or grain filler.
Using a film finish on porous, open grain, or closed grain hard wood will build film finish faster. Must lightly sand between coats of vanish and poly.
Wood conditioner can buy commercial product or use shellac for softwoods to prevent blotching of stain or final finish.
Wood fillers, not something want to use on pens.
Sealers and Pore Fillers | Articles | Woodworkers Journal
If going to use CA as final film finish, wasting time with sanding sealer, wash coat or wood filler.