Polimax Ultrasoft Polyester putty is an unsaturated polyester resin based putty, whose soft consistency allows application with ease, and leaves a smooth surface without forming pinholes. It’s advanced formula gives it great adhesion to metal and galvanic surfaces. The putty’s being suitable for both wet and dry sanding allows its user maximum comfort while applying. Thanks to its benzoyl peroxide hardening agent, Ultrasoft will harden even in low temperatures. It leaves non–sticky surfaces by not causing any shrinkage during curing. Polimax Ultrasoft Polyester putty will leave a smooth surface, without any pinholes, shrinkage or cracks.