I am finishing a table and have just completed staining the white oak. I plan to apply a barrier coat and then apply a gel stain as a glaze. In reading the varius articles on this site it seems that Shellac is the prefered finish to use as a Barrier coat. However, I have Waterlox Original Sealer and Finish on hand and would like to use that. Is shellac really better? If so can I use Zinsser Sealcoat for this purpose?