Prime Lock Plus Alkyd Primer/Sealer Primer - PS-8000Prime Lock Plus Primer Sealer Stain Blocker is a high hiding, alkyd resin based, primer sealer stain blocker for interior use and spot priming exterior surfaces. Excellent for priming over plaster, drywall, wood and previously painted or varnished surfaces. It can be top coated with any oil or latex paint. It provides excellent enamel holdout and will not raise wood grain. Use it as a primer prior to applying most wall coverings. It has excellent