Question 1

How long does interior paint need to dry before a second coat?

Accepted Answer

It depends on the product, so the recoat time printed on the can or technical data sheet is the number to follow. For example, one PPG flat latex lists dry to touch in 30 minutes and recoat in 4 hours, measured at 77°F and 50% relative humidity. The same sheet notes that drying times vary with temperature, humidity and air movement, so cool or damp rooms take longer. Oil-based and specialty coatings usually have different, often longer, recoat windows.

Question 2

How many coats of paint do I need?

Accepted Answer

Most repaints look best with more than one finish coat, because a single coat often leaves uneven color and sheen. You may need extra coats when making a big color change, covering a dark color with a light one, or painting over patched areas. Priming new drywall, bare wood or stains first usually gives a more even result than adding extra topcoats. Check the product data sheet, since many manufacturers state how many coats they recommend for a given surface.

Question 3

What paint sheen should I use in each room?

Accepted Answer

Use flat or matte on ceilings and low traffic walls, eggshell or satin on most living area walls, and semi-gloss on trim, doors, kitchens and bathrooms. Flatter finishes hide surface flaws better but are harder to scrub. Glossier finishes clean up more easily and resist moisture, but they highlight dents, patches and roller marks. Pick the sheen for the room's traffic and lighting, then check that the specific product is rated for that use.

Question 4

How do I estimate how much paint a room needs?

Accepted Answer

Measure the paintable area, divide by the product's spread rate, and multiply by the number of coats. Find wall area by multiplying the room's perimeter by the wall height, then subtract large doors and windows. Use the spread rate from the product's data sheet, because it varies widely; one PPG flat latex, for instance, lists 400 to 500 square feet per gallon. Rough, porous or unprimed surfaces absorb more paint than the sheet assumes, so order a little extra for those.

Question 5

Do I need to prime before painting?

Accepted Answer

Prime when the surface is new, bare, stained, glossy or changing color dramatically. New drywall, bare wood, patched areas and water or smoke stains all benefit from a primer made for that problem. A sound, clean, previously painted wall in a similar color often does not need a separate primer. When in doubt, follow the topcoat manufacturer's surface preparation instructions.

Question 6

Is lead-safe certification required to paint an older home?

Accepted Answer

Yes, if you are paid to disturb paint in housing or child-occupied facilities built before 1978, the EPA Renovation, Repair and Painting (RRP) rule requires certification. The firm must be EPA or state certified, and the work must be done or directed by a certified renovator trained by an EPA-accredited provider. Minor jobs that disturb six square feet or less of paint per room inside, or 20 square feet or less outside, are exempt, but window replacement and demolition of painted surfaces are always covered. Some states run their own programs, so check which agency applies where you work.

Question 7

How can I tell if a home might have lead paint?

Accepted Answer

Start with the year the home was built: the federal ban on lead-containing paint for consumer use applies to paint manufactured after February 27, 1978, so older homes are the ones at risk. Age alone does not prove lead is present or absent. The only way to know is to have the painted surfaces tested before work that will disturb them. Until then, treat paint in pre-1978 housing as if it contains lead.

Question 8

What do painters have to give homeowners before lead-safe work?

Accepted Answer

Before RRP-covered work in pre-1978 housing, the firm must give the owner EPA's lead hazard pamphlet no more than 60 days before work begins. The firm must get the owner's written acknowledgment of receipt, or keep a certificate of mailing dated at least 7 days before the work starts. If the unit is occupied by someone other than the owner, an adult occupant must also receive the pamphlet. Keep these records with the job file.

Question 9

Can I paint when it is cold or humid?

Accepted Answer

You can only paint within the temperature and humidity range the manufacturer lists for that product. Published dry times are measured under set conditions, such as 77°F and 50% relative humidity on one PPG data sheet, and the manufacturer notes that real drying times vary with temperature, humidity and air movement. Cold, damp conditions slow drying and can cause poor film formation. Check both air and surface temperature against the data sheet before you start.

Question 10

How long does paint take to fully cure?

Accepted Answer

Paint that feels dry is not fully cured, and full cure takes much longer than the recoat time. During that period the film is softer and easier to scuff, so go easy on scrubbing, taping over it and pushing furniture against it. Cure time varies by product and conditions, so check the data sheet for the manufacturer's guidance. Let homeowners know this at the walkthrough so early marks are not mistaken for poor work.

Question 11

How should a painting contractor bid a job?

Accepted Answer

Build the bid from measured quantities, realistic production rates for your crew, and the actual condition of the surfaces. Account for prep work such as patching, sanding, caulking, masking and moving furniture, which often takes longer than painting. Add materials based on product spread rates and coats, then access needs like ladders or lifts, plus overhead and profit. Pricing varies by market and job, so track your own past jobs to calibrate production rates rather than relying on generic figures.

Question 12

Can I put latex paint over oil-based paint?

Accepted Answer

Yes, but only after proper preparation, or the latex may peel. Clean the surface, dull the gloss by sanding or deglossing, and apply a bonding primer rated for use over oil-based coatings. If you are unsure what the existing paint is, test a small area first. Follow the primer manufacturer's instructions for surface prep and recoat time.

Painting FAQ: Dry Times, Coats, Sheen and Lead Rules