Stain Not Penetrating Wood. A very common problem for wood stain to not penetrate into a surface is it still has finish,. Wood has pores and the larger (more porous) the easier it is to.

A very common problem for wood stain to not penetrate into a surface is it still has finish,. 4 reasons why stain isn’t penetrating wood 1. Wood has pores and the larger (more porous) the easier it is to.