FIBER GLASS PREVENTS “WICKING” OF MOISTURE UNDERNEATH COATING! This means that Pace Products made with fiber glass will last much longer than ordinary coatings using cheap “fillers”. Moisture is the deadly enemy of roof life. It becomes dangerous when it gets underneath the roof mat. As long as the coating and roof mat offer a solid barrier resistant to penetration, there is no problem. When a break develops, even an opening the size of a pin prick, moisture creeps in. Roof protection begins to break down.