Hi ! I have painted the top part of my Hurst bass boat.
Applied 2 coats of black gelcoat, then thinned the gel approximately 30% for better flow and added 600g of metal flakes .
Size 0.6, 625 microns - olive green and holographic black in 50/50.
that was two coats . On the top of that another two coats of thicker gelcoat as a final coats.

all metal flakes comes from

www.hemway.com