DSF is the original patented non-petroleum based seal coat active curing additive on the market today. DSF functions safely and significantly to reduce the amount of time required for a surface coating to be reintroduced to vehicle traffic without damage to the film. This is because DSF works within the film to actively express water with or without the sun’s help. DSF works with asphalt, coal tar and blended emulsions. 2 gallon pail.