Painting Stucco and Mission Revival Plaster in Riverside

On an old plaster wall that has never been sealed, every step of a repaint takes longer, and the first step is reading the surface. Painting stucco in Riverside, CA means working out what the wall has been through, and work booked through painting contractor riverside black tea society for Mission Revival houses starts the same way. A good painting contractor checks cracks, chalk and salts before choosing a product.

Reading the cracks

Hairline cracks in stucco are normal after decades of heat cycles. A crack thinner than a credit card edge gets filled with elastomeric patching compound or flexible caulk, worked in with a damp brush. Anything wider, or any crack with a step between its two faces, points to movement, and that is a plasterer's question before a painter's.

Efflorescence and chalk

White crystals on a masonry wall are mineral salts pulled out by moisture, and they show up near planters, sprinklers and the base of walls. They are brushed off dry, the wall is washed, and the moisture source is fixed. Painting over them traps the salt, which pushes the new paint off in flakes. A hand run across the wall shows chalk, and chalky stucco needs a wash and a bonding primer.

Matching the original texture

Repairs on Mission Revival plaster have to match the original finish, whether a smooth sand float or a rougher lace texture. Spackle is the wrong material outside, so the crew uses stucco patch, textured with a sponge or brush while wet, then lets it cure before any coat goes on. A patch sealed too early shows as a darker spot through the topcoat.

Primer and a breathable topcoat

Masonry primer goes on first, and bare patches get a spot coat before the full coat. A breathable acrylic topcoat lets moisture vapor leave the wall, while a thick oil based coat or glossy enamel can trap it and blister. Flat or low sheen suits stucco best, since eggshell or satin makes every trowel mark and patch show in raking sun.

Applying the coating

A thick nap roller pushes paint into the pits of the texture, and an airless sprayer helps on big elevations when followed by a back-roll. Two coats are standard, because one coat rarely reaches the right mil thickness in the valleys. Cut in around window frames and arches with a brush, and mask the tile where the roof meets the wall.

Timing around the weather

Riverside gets under ten inches of rain a year, so the wet season is short, but stucco still has to be dry before coating. Fresh patches need days to cure, and a wall damp from sprinkler overspray needs time before any primer touches it.