Stick with what you know Marcel. By the way, I only sand the mould surface down to 1000 grit then go with the Maguires Mould release (3 coats). This leaves the surface of your finished product with a "matte finish". The matte finish can then be sanded with more 1000 grit to remove all the mould release and allows a good surface for spraying on what color gel coat you choose. For coloring the resin I use any 100% acrylic artists paint found at an art supply store. It doesn't take a lot of it to get dramatic results either.