Plastic grit we deal in is an another soft medium, made from recycled as well as waste plastic. This is typically used to clean the surfaces and remove the old paint. It can perform its work without harming the substrate. The advantage of using Plastic grit are many. This is a non-toxic grit, which ensures zero damage of most substrates, such as fiberglass, aluminum and dense hardwoods. It can make zero harm to harm coatings, delicate components and gel-coats.