Hydrophobically modified Si-containing polyamines are useful for treating scale in industrial process streams. Preferred hydrophobically modified Si-containing polyamines are particularly useful for treating aluminosilicate scale in difficult-to-treat industrial process streams, such as in the Bayer alumina process streams, nuclear waste streams and kraft paper mill effluent streams.

Dispensing systems for sealants, including room temperature vulcanizable (RTV) silicone sealants, are disclosed. These systems are not only simple to use, but also improve the precision with which the user can dispense product, resulting in a more satisfactory appearance and reduced product waste.