How to Mix Plaster & Paint for Undercoating

eHow may earn compensation through affiliate links in this story. Learn more about our affiliate and product review process here.

Things You'll Need

  • Latex paint

  • Large mixing tub

  • All-purpose joint compound

  • White glue

  • Drill

  • Paint paddle drill attachment

  • Safety goggles

  • Latex gloves

Joint compound is a plaster-like substance that adds body to paint.

Plaster-type products in your undercoat paint give your walls texture and hide flaws. All-purpose joint compound is the best product to use for this purpose. It is similar to plaster of Paris, but it will not shrink, crumble or crack the way true plaster can. Mixing your paint with joint compound lightens your paint color. But this is an undercoat, so it is less important because the finish coat is the color that shows. However, you should choose a finish coat that is close to the color of the undercoat in case a scratch goes through to the undercoat.

Advertisement

Step 1

Stir your latex paint thoroughly, and pour it into a large mixing tub.

Video of the Day

Step 2

Add a half gallon of joint compound for every gallon of paint in your mixing tub. Use only the premixed all-purpose form of joint compound. Other types do not mix well with paint and can dry too quickly or too slowly.

Advertisement

Step 3

Add 1 pint of white glue for every half gallon of joint compound in your mix. The glue helps bind the paint and joint compound to each other and your walls.

Step 4

Secure a paint paddle drill attachment to a drill. These paddles are wide, often wave-shaped blades with openings along the blades. Many look similar to ice cream maker paddles.

Advertisement

Step 5

Put on safety goggles and latex gloves. Sink the paddle into the paint without immersing the drill itself, and turn the drill on its lowest setting.

Step 6

Stir the paint as thoroughly as you can with the drill attachment, then reach into the mixing tub with your gloved hands and feel for any clumps of joint compound.

Advertisement

Step 7

Break up any clumps you find with your fingers, and then mix the paint again with the drill attachment until it is smooth. At this point, it is ready to apply to your walls with a roller, brush, sponge or putty knife.

Advertisement

references

Report an Issue

screenshot of the current page

Screenshot loading...