Shellac Over Latex Paint. What do you feel is the safest stainblock coat over the acrylic thats on there? I now have tannin bleed, which surprised me with oak. Use a viscosity cup to measure.

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Oil primers and paints take longer to dry and require additional ventilation. Something that might work in isolated cases is not a generic solution. Oil based paint soaks into the surface being painted (like a wood porch floor) but you only use primer over bare wood or stains.

Shellac is a wood finishing product made by dissolving dried resin in denatured alcohol.

But i would be careful in spraying a large project with shellac. Shellac was used heavily for finishing furniture during the 19th and early 20th centuries, and it is still available for use today. I used kilz odorless brushed as the primer(bad mistake!!) and 2 coats cabinet coat sprayed as the finish. I now have tannin bleed, which surprised me with oak. I have only ever sprayed latex and latex primers through my machine, or any machine to be honest. I have some wood scraps that i want to tole paint on for exterior use. Minwax polycrylic protective finish water based. As a general rule, latex primers are used for drywall and soft woods, although there are a few notable exceptions.