Where applicable add surface seal for surface curing. CATALYST SOLD SEPARATELY. ISO NPG polyester gel coat color. Great for boat building, repairs, molds, spray up processes and hand lay up. This gel coat cures with a surface tack. There is no need to sand between layers. Where applicable add surface seal (wax) to the final layer for a non-tacky surface cure. This gel coat can be thinned using styrene monomer for spray applications. Cures at room temperature with the addition of MEKP. MEKP CATALYST is sold SEPARATELY. NO WAX.