Main components of manufactured sealant were vinylester resin, polybutadiene rubber, asphalt and inorganic filler. For manufactured sealant, liquid and cure properties were tested experimantally. It showed better mechanical properties at rubber content $5{sim}15phr$. Blown asphalt represented better properties than streight asphalt, showed the highest cohesive strength at asphalt content $6{sim}8phr$. Appropriate usage of filler was $60{pm}2%$ of total components, and $Al(OH)_3$ showed better flame-retardancy than $CaCO_3$.