Kapci 625 3L High Build (4:1) 2K Primer Filler Kit 3L Grey PLUS 750ml Hardener.  Multifunction primer: can be used as a primer filler or surfacer. It is a flattable 2K filler developed for use inder 2K paint. It is easy to apply and flat giving a good final finish. Supplied with 750ml of Hardener.