- Over application of product (rolling too rapidly)
- Finish coat was applied over an unprimed, porous surface
- Wrong roller cover nap length
Causes:


RECOMMENDED SOLUTIONS
- Sand any rough patches before painting to eliminate texture that can trap air
- Avoid excessive or fast rolling
- Apply in a gentle, controlled W-pattern and back-roll lightly
- Prime first, especially over porous or bare surfaces, to prevent the finish coat from soaking in unevely
- Stir paint gently — do not shake, as this introduces bubbles into the can