Primer paint's purpose is to seal and protect a wall or ceiling. Whether it's applied over new sheetrock or over an old paint job, primer has properties to give the surface "tooth" so that the base coat paint will adhere better. But if primer lands in your carpet, you'll need quick action. First check to see if your primer is made of water, oil or shellac. If you've used shellac, ammonia is generally recommended for cleanup. For water- or oil-based primer, Folex or Spot Shot carpet cleaners should take care of the problem.
Things You'll Need
Folex Instant Carpet Spot Remover
Spot Shot carpet stain remover
Blot up primer paint that is still wet with a folded paper towel. Resist the temptation to scrub or rub the spot.
Test ammonia, Folex or Spot Shot carpet cleaners on an inconspicuous area of your carpet. Be sure it doesn't change the color of the carpet before you proceed.
Spray one of the carpet stain removers on the primer spot without saturating the carpet. Apply ammonia with an old rag if your stain is from shellac-based primer. It's important not to soak the product into the carpet backing. Wait a minute before proceeding if the stain has already dried.
Blot out the stain with a clean wash cloth. Work the stain with either your fingers or a spoon to make it easier to remove. If some stain remains, spray, blot and repeat the process.
Rinse the area with cool water when the stain is gone. Use an old wet wash cloth to move, not rub, in all directions.
Check the back of your specific can of primer for helpful ideas from the manufacturers.
Use ammonia only on shellac based primers, not on water- or oil-based products. Rubbing your paint spot could damage the fibers in your carpet. Don’t use paint thinner on your carpet.