Finish TradesCâu 223 / 700
Cedar and redwood siding can bleed brownish stains through ordinary paint. Which primer choice BEST prevents this discoloration?
a.A thinned latex topcoat used as its own primer
b.No primer, just extra topcoats
c.A high-gloss clear varnish
d.A stain-blocking primer that seals the water-soluble tannins in the wood
Giải thích
Cedar and redwood contain water-soluble tannins that migrate through latex paint and cause brown staining. A dedicated stain-blocking primer seals the tannins so they do not bleed through. Self-priming topcoats, no primer, or clear varnish do not lock in the tannins.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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