This resin is modified to allow it to be brushed on in thicker coatings without sagging or running. It also has a surfacing agent added to assure a bone-dry surface cure. Can be cured by either UV light or by MEKP catalyst or both. If curing by UV light alone, you can cure to B-stage, remove from UV light and make a perfect razor-trim without haste. When done, resume curing to finish