Each additional coat of paint, particularly elastomeric and silicon-based coatings, reduces vapor transmission of the wall system. This can lead to deterioration in the wall because the moisture naturally generated from inside is not able to escape as designed. Each additional coating application can further exacerbate the problem.
M3P Overcoat is a highly permeable coating that is formulated to bond tenaciously to elastomeric coatings, as well as acrylic and silicone paints. M3P Overcoat passes ASTM E514 (100% reduction of water penetration and leakage).
M3P Overcoat is a mineral silicate-based chemistry with the addition of an acrylic component. The addition of the acrylic is to create adhesion between Overcoat and a previously applied coating. Silicone and elastomeric coatings reduce the breathability. Application of M3P Overcoat produces a fresh natural appearance without changing water vapor transmission.