I am building a wine cabinet and the top is going to be made out of African mahogany. I really would like a high gloss, glass-like finish. I know I am supposed to add a washcoat and a grain filler, but what order do I apply them in. I have shellac, denatured alcohol, a pore filler, transtint dye. Also, can I use polyurethane as a final topcoat?