We tint our primer with half of the formula of our Full Spectrum Paint colors to ensure better coverage and consistency of color. NEVER use a gray tinted primer under our full spectrum colors. The gray bleeds through and dulls the color. Please note color you'd like primer tinted in our "notes" section. Seal Grip Interior/Exterior Acrylic Universal Primer/Sealer is PPG's premium primer is especially formulated to block most stains - water, smoke, ink, markers, and tannin. It also has exceptional adhesion to glossy surfaces. Recommended as a whole house primer for use on properly prepared interior or exterior wood, masonry, plaster, wallboard, cement, brick, stucco, cement composition board and wall coverings.