PRO XL 1K Primer Surfacer BLACKProXL is a professional range of coatings developed to provide a total product system that will increase productivity, without compromising on quality. This winning formula is the result of years of 'hands on' experience coupled with the latest technical developments in the aerosol industry.Spectro prime: a premium coloured primer/surface for fast spot priming under topcoats providing a smooth pin hole free surface that can be easily sanded or used wet on wet. Can be used directly onto difficult substrates as an excellent etch primer.