Chemcraft offers OmniBuild™ Pro, a new primer surfacer designed to tackle challenging substrate variations while building a thick and smooth foundation for topcoating. The conversion varnish primer has a high-solids formulation that provides superior build, sag resistance and hide, the company says. It has a 24-hour pot life, works with all spray systems and flat line machinery, sands quickly and has a fast stack time, making it production-friendly. It can be used on a variety of substrates, including routed MDF.