Finish TradesQuestion 223 of 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
Explanation
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.
Practice all 700 questions free — no signup required.
Related questions on this topic
- An old, sound exterior paint film shows heavy chalking (a powdery residue on the surface). Before repainting, the MOST important prep step is to:
- Why do finish carpenters and painters often 'back-prime' exterior wood trim and siding before installation?
- A room measures about 12 ft by 15 ft with 8 ft ceilings. Ignoring openings, the four walls total roughly 432 square feet. If one gallon of paint covers about 350 square feet per coat, how much paint is needed for TWO coats (rounded up to whole gallons)?
- Before hanging vinyl wallcovering on new, primed drywall, why is a wallcovering primer/sizing typically applied?
- A tile setter spreads thinset mortar but leaves it too long before placing tile, and a skin forms on the ridges. What is the MAIN risk of setting tile into skinned-over thinset?
- An uncoupling (crack-isolation) membrane is installed between a concrete slab and ceramic tile. Its PRIMARY purpose is to:
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB General Building (B) Trade Examination · How we review