While you can paint wallboard in a day or two, you ’ ll need a workweek or more to finish
painting concrete. Continue reading below for tips — plus costs — on how to paint concrete surfaces :
1. Clean the Concrete
Cleaning concrete is a vital first dance step because the porous surface tends to trap crap, grease, and petroleum .
1. Remove dirt and grease with trisodium phosphate ( $ 6.30 per quart concentrate ), or choose a more Earth-friendly clean like Krud Kutter ’ s pre-paint clean ( $ 10 for 32 ounces ).
2. Yank off vines and moss growing on the foundation garment. Use a press washer to finish off remaining roots and dirt .
3. Remove rash, a egg white powder that forms on damp concrete. Try Krud Kutter Concrete Clean & Etch ( $ 8.50 for 32 ounces ) ; if you need more scavenge muscle, try phosphorous acid masonry clean ( $ 27 per gallon ) .
2. Strip Old Paint
Strip undress or blistering paint indoors with a cable brush ( $ 3 to $ 5 ), a paint scraper ( $ 10 to $ 20 ), and lots of elbow grease.
Outdoors, get rid of old paint with a might washer ( rents for $ 40 to $ 75 per day ) .
3. Seal Interior Concrete
Water moves well through porous concrete, so sealing interior walls is necessary to prevent moisture from seeping in, promoting mold growth and that cold, damp basement feel. Use a masonry sealer, such as ThoroSeal, that besides patches cracks ( $ 35 for a 50-pound bag ).
cautiously follow directions for shuffle, applying, and curing the sealer. ThoroSeal, for example, requires two coats ; the manufacturer recommends curing for five to seven days before applying the moment coat .
4. Prime the Concrete
Concrete primer, called parry flat coat, fills pores and evens out the surface. For outside foundations and walls, use exterior-grade block makeweight, such as Behr ’ s Concrete and Masonry Bonding Primer, which besides is effective for inside concrete ( $ 17.98 per gallon ). Primer dries in two hours ; delay at least eight hours, but no more than 30 days, to paint .
5. Paint the Concrete
Masonry paint ( besides called elastomeric paint or elastomeric wall coating ) is a good choice for concrete painting because it contains binders that contract and expand with the concrete. Exterior house paint can crack and peel on concrete .
Masonry paint ( $ 20 per gallon ) can be tinted and is much thicker than outside rouge. Apply it with a masonry brush ( $ 5 to $ 8 ), a high-capacity ( 3/4-inch or higher ) roller, or a texture roller ( $ 5.50 ).
Some freemasonry paint is thicker than outside paint and contains fine particles that can clog air sprayers. If you want to spray-paint cement, ask your local paint store for a product that will work well in a sprayer ( $ 300 ) .
No matter how you apply rouge, let it dry for a day between coats. You ’ ll credibly need two to three coats, so check the long-range weather forecast before you begin .