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A sealant composition for roofing shingles is described that includes base asphalt, a linear and / or radial copolymer, oil, and a wax. The linear copolymer has an A-B diblock or an A-B-A triblock structure. The radial copolymer may have an (A-B)n radial structure, where n is at least 4, or a triblock radial structure having four to eight arms. Blocks A and B may individually represent (1)...