Licensed General Contractor, Painting Contractor, Christmas Light Installer
I'm not so sure you're able to provide a comprehensive assessment of BIN since you don't use it. I can think of probably 30 finishers around the world who would disagree with your claims. As far as your comment regarding de-waxed shellac, not only can it be used as a washcoat, it can also do well as a barrier coat when trying to refinish over problematic or unknown finishes, so it IS actually useful for refinishes as well as new wood.Yes i did.One is spot primer and other is sanding sealer and none of them work properly on your project.
If you want to learn more please download msds.Since i do not use BIN as a wood primer and i cannot say what is it made or what is the difference.
On the other hand De-waxed shellac is nothing more than a #2 cut 17 percent solid clear shellac.Not suppose to be use for refinishing.Just as a wash coat to control the stain strength on the bare wood surface.
Please don't misunderstand what I'm saying. The way you do things clearly works for you. The pictures you show on projects seem to produce wonderful results. But I do take exception to people who claim their way is the only way, (especially when it isn't).
From Zinsser Sealcoat,
"Zinsser ® Bulls-Eye® SealCoat Universal Sanding Sealer is a 100% de-waxed shellac-based sanding sealer designed for use as an undercoat to prepare new or previously finished interior wood surfaces or as a pre-stain sealer and wood conditioner. "