Here are two different exterior surfaces that may currently be on your home and how to repaint or paint to add a new look and longevity.
Whether you're coating a new substrate or repainting an existing one, it pays to use the correct products and procedures. Here is a guide to coating two of today's exterior surfaces.
Fiber-cement siding, a combination of Portland cement, ground sand, cellulose fiber and select additives, holds paint exceptionally well.
When improperly treated, cement-based products can be mildew magnets. A high quality exterior acrylic masonry primer will fortify the siding's mildew and efflorescence resistance.
Sherwin-Williams Duration® Exterior Latex Coatings are the best topcoat choices for new fiber-cement siding. Because they have a substantially higher film build than conventional paints, only one coat is necessary over a primed surface – and Duration is guaranteed not to peel or blister. Other high-quality exterior latex paints designed for cement-based building materials – such as Sherwin-Williams Loxon Masonry Topcoat – also perform well but will require two coats.
When repainting fiber-cement siding, pressure wash to remove all dirt, dust, grease, oil, loose particles, foreign material and defective coatings. Rinse thoroughly and allow to dry. Scrape away any remaining peeled or checked paint, and sand those areas. Also sand any glossy surfaces to make them dull.
Unless the substrate is exposed, a primer is not required when repainting fiber cement. One coat of Duration is all that's needed.
The trick with painting or repainting brick is to power-wash or clean the loose powdery surface well enough without destroying it. This will minimize efflorescence problems later on. You'll get maximum performance from Sherwin-Williams Loxon Masonry Primer. For the topcoat, use two coats of SuperPaint or one coat of Duration.
The condition of the substrate is critical when painting or repainting. Brick or mortar cracks will telegraph through the topcoat and should be repaired with patches and sealants prior to painting. Paint the substrate with SuperPaint or Duration. If the job calls for waterproof protection, go with an elastomeric coating such as Sherwin-Williams ConFlex XL High Build Coating, which also can cover and hide hairline cracks.
Note: Brick should be allowed to weather for at least a year and then wire brushed to remove efflorescence. Treat the bare brick with one coat of Loxon Conditioner before painting with a masonry compatible latex paint like SuperPaint, or, better yet, Duration.
Prep Makes Perfect
Paint failure is generally a symptom of poor surface preparation. Thoroughly cleaning the surface assures proper bonding of the paint and helps you get the most from your topcoat. Other considerations:
Old paint: Make sure glossy surfaces of old paint films are clean and dull before repainting.
Efflorescence: If you see white fluffy deposits of salt crystals on the surface, scrub them off before painting.
Mildew: If there is the appearance of dirt even after washing, chances are there is mildew on the surface. Remove mildew and allow the surface to dry for 48 hours before painting.
Weather: Never paint immediately after a rain, when rain is predicted or during foggy weather. As a general rule, humidity should be no more than 85 percent. Avoid painting when temperatures rise above 90° F or fall below 50° F, unless the products are designed to be used under those circumstances.
There’s still time to get the outside of your home looking its best before the colder weather starts moving in. Call or email Moorhouse Coating TODAY!