TotalBoat Penetrating Epoxy Sealer is a good choice for sealing a bare wood guitar before applying primer or paint. Its low-viscosity formula penetrates the wood grain, helping to seal and stabilize the surface while providing a suitable base for a finish coat.

After the epoxy has fully cured, wash the surface with warm water and mild soap while scrubbing with an abrasive pad to remove any possible amine blush. Allow the surface to dry completely, then sand it and clean it with acetone or denatured alcohol before applying primer or paint. Allow Penetrating Epoxy Sealer to cure for 5 days before overcoating.