How to Thin Spray Primer

If you’re planning to prime and paint a large surface area, such as the exterior of a house, airless spraying the surface is often the best system —-not only it’s quicker and easier than using a roller, but it also produces more even coverage when done correctly. Like paints, primers can be too thick to spray, and you might have to thin them slightly to get good results. Some primers are formulated for spray application and don’t need to be thinned at all; others lose their effectiveness when thinned. Check the manufacturer’s instructions to determine whether to thin the primer.


  1. Read the label on the can of primer and look for thinning instructions. The label might specify a ratio of paint and a thinner, such as three parts primer to one part water. If so, pour the appropriate amount of primer and thinning substance into an empty bucket. Stir the mixture to blend it evenly.
  2. If the label does not specify a ratio. Spray the primer onto a test board to evaluate its thickness. If it sprays in a thin, even mist, you don’t need to thin it further. If it sprays thickly or with difficulty, you do need to thin it.
  3. Add a small amount of clean water to water-based primer or a small amount of mineral spirits to oil-based primer. Keep track of how much you are adding. Stir it in thoroughly, and test spray the board again.
  4. Continue adding small quantities of thinner to the primer until it sprays easily. Note how much you needed to add to the can of primer so that you can add the same amount to the next can.

DP-6337iB is a professional electric airless paint sprayer, 2500w brushless motor and max. 7.0L/min sprayer with low position valve, ideal for high viscosity coatings painting, like primer / floor epoxy / putty plaster / dry wall mud / block filler etc.

Language in: German

  • Related post
  • Related products
  • Video
  • Comments

Leave your comments

Name *

Mail (will not be published) *

Country *

8+8=? Verification code *


Your Name

Your Phone

Your Email Address

Your Website

Your Country

You Are

You want to use our paint sprayer for

What material do you spray?