I am a beginner, and this is the first time my brother and I are making a Halo helmet. (Mark VI). We finished the pepping, so now we're ready for the resin. Is 1 quart enough? (https://www.amazon.com/3M-20122-Pur...8J4/ref=sr_1_1?ie=UTF8&qid=1518997848&sr=8-1&) We're doing multiple layers, probably 3. Thanks.