HMG Synthetic High Build Primer Grey 5L. This synthetic high build primer from HMG has excellent adhesion properties, and it's high build qualities allow for the filling of minor scratches and impefections prior to painting. We also supply this product in both 1L and 5L tins in White and Grey. On occassions these products are dispensed into our own Autopaints containers. Please be assured these contain the product as stated and are not inferior products.