Crack Sealant Job Material Calculator. Enter Job Criteria. Total Lineal Feet of Crack to be Sealed Ft. Typical Crack WIDTH. Select 1/8" 1/4" 3/8" 1/2" 5/8" 3/4" 1". Typical Crack DEPTH. Select 1/8" 1/4" 3/8" 1/2" 5/8" 3/4" 1". Select Crackfiller Product. Select GemSeal® Crack Flex Pro GemSeal® Crack Flex Pro S Durafill 3405 Durafill HS ...