marz442 said:
It's like body filler, only stronger and waterproof. It's paintable and sandable. don't use it on anything other than pinholes and make sure you buy a professional brand (Eastwood, U-Pol). They make two kinds- short stand and long strand. Long strand is better for bigger holes but harder to work with. Short stand is easier to work with but won't fill as big of holes as long strand.
