This is a water-based, silicon, elastic exterior primer that minimizes the consumption of filler paint. It can be used as a primer under all kinds of exterior paints. The exterior walls primed with Exelans Primer are humid-proof, and require less paint as the water absorbance of the plaster will be reduced. Both on new surfaces painted for the first time and old painted surfaces, Exelans Primer ensures strong adherence of the new paint to the old paint. Due to its elastic structure, it prevents formation of cracks on the surface by acting together with Exelans Paint against ground movements. It improves coverage as a filler primer.