2K HS very fast acrylic filler 4:1 ideal for car refinish, truck, marine. High build filler, easy to apply and to sand, very fast drying and no shrinkage at all. - Ideal for partial paintings and little repairs, but it can be also used for total paintings by using slow hardener and thinner. - Very fast air drying, to speed up the process you can also use oven, fast drying systems or IR