Dow Corning 733 glass and metal sealant is a paste-like, one-component material that cures to a tough, rubbery solid upon exposure to moisture in the air. Because it does not flow, this sealant can be applied overhead or on sidewall joints and surfaces without sagging, slumping or running off. - Dow Corning 733 glass and metal sealant is specially formulated to provide good adhesion to various substrates. Good resistance to weathering, vibration, moisture, ozone and extreme temperatures.