Factory roof directly painted on the cement board directly spray the white again
Do not require a full cover, and so spray the paint does not stick and then spray. Several spray can be completely covered.
And other primers completely dry and then spray from the painting should not be much problem. Be careful not to spray too thick.
Most of the paint from the nitro paint, do not know what you use (Ming paint) What is the nature of the paint? With easy to bite the bottom of the reaction.
