I used the Imperial Compound to restore a 17' fiberglass boat.  It had scum line stains as well as the white fiberglass was dingy looking and oxidized.  I used a rotary buffer (required) and this 3M Superbuff pad&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/3M-05703-Superbuff-9-34-Buffing-Pad/dp/B001445AU6/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">3M 05703 Superbuff 9" Buffing Pad</a>