Gentec & Greentec GTCGTC720Q 1 qt. Ultimate High Gloss Clearcoat – 4-1 Mixing. GENTEC AND GREENTEC PRODUCTS GTC720Q Ultimate Clearcoat 1 qt High Gloss 4:1 Mixing. Engineered with durability and ease of use in mind it ensures efficiency and long-lasting results for both professionals and hobbyists.Features.