And bond toughness. Pick a primer suited to epoxy or a common bonding agent, dependant upon the product. If it doesn’t seal the substrate, the subsequent coatings will outgas leaving bubbles or voids. Squeegee and back again-rolling is the preferred system. Squeegee software may help fill voids within the substrate. https://www.propanraya.com/id/produk/epoxy-fast-dry