3M 730

3M Sealant 730 UV is a clear, one-component silane-modified polymer sealant for cosmetic panel joints in vehicles and architectural assemblies. The isocyanate-free, low-VOC formulation cures with moisture, fills joint gaps, and remains permanently elastic after cure. A surface skin forms in 40 to 60 minutes while moisture curing continues within the joint. Water-based paint can be applied while the sealant is wet. Its transparent appearance and UV resistance suit exposed seams where a visible opaque sealant line is undesirable, including panel sealing on trucks, trains, trailers, and specialty vehicles.

Key features

• Clear SMP sealant: The one-component, isocyanate-free formulation forms a transparent, permanently elastic joint seal.
• 40 to 60-minute skin time: This interval applies to formation of the surface skin, not full cure.
• Wet-paint compatibility: Water-based paint can be applied before the sealant has dried or cured.

Applications

Panel sealing on trucks, trains, trailers, and specialty vehicles; architectural panels.