This is a high solids, pigmented 100% acrylic polymer blend containing special additives that produce a sound base over extremely weathered concrete roof tiles. These tiles usually have all of the original coloured layer removed which then leaves a porous sandy looking finish. This coating ensures the filling of this porous surface which will then produce a finish that is fully sealed and waterproof after the top coat has been applied. The following diagram represents a view of the function of Foreverfinish Primer Filler.