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In my experience PC-Petrifier brand, non-solvent, water borne wood hardener, makes a very good sealer prep for acrylic stains and finish coats. It is very thin, absorbs deeply and well, gives a good hard surface that still has tooth, sands well, with no antipathy to water or oil based products used over it .Though it may appear to dry quickly give it a good 24hrs. to cure.
Likewise Elmer's brand carpenter's interior wood filler is a very easy to use water soluable product . It can be worked and reworked with water, applied and modeled with a palette knife or your fingers, easily sanded and does not dry harder than the wood, allowing for uniform even sanding, and takes stain. If it dries in the container tub, it can be revived by mixing in more water , reducing waste. It may also be sealed with the above mentioned product along with the surrounding wood to accept any kind of finish.
Hope this helps, PG
Likewise Elmer's brand carpenter's interior wood filler is a very easy to use water soluable product . It can be worked and reworked with water, applied and modeled with a palette knife or your fingers, easily sanded and does not dry harder than the wood, allowing for uniform even sanding, and takes stain. If it dries in the container tub, it can be revived by mixing in more water , reducing waste. It may also be sealed with the above mentioned product along with the surrounding wood to accept any kind of finish.
Hope this helps, PG