GULFF has selected a range of special UV resin products for its product range, which are specifically desired by fly tyers and retailers. Special range products will be subject to campaign changes and may just be the ones you have suggested. Nor would it be the first time the product bore the name of the referee. Of the resins in this product range, Dirty Motor Oil reached almost a cult status even before it entered the market. Black resin is a forever classic and honey-like Amber is as it was made for little nymphs, larvae and shrimp.