Pronto Extra Wetter is used in circumstances where asbestos is likely to become airborne. That may be when solid asbestos insulation is being removed from boiler pipes or steel girders. It may also be used in dusty operations, such as surface preparation or clean-up. Extra Wetter wets out the particles and keeps them from becoming airborne. Coverage will vary depending on the surface being treated and how long it will have to stay wet. Porous substrates, such as solid insulation, will require much more solution that less porous surfaces. Extra Wetter is never added to mastic removers or any other product. Dilution ratio: 50 to 100 parts water to one part product. Sold in 5 gallon pails