This product is for INDUSTRIAL USE ONLY and not for use at homes, schools or in recreation. This is an industrial product intended for use by industry. Plastic-Craft Products reserves the right to substitute similar quantity of Weld-On 4SC for Weld-On 3 or Weld-On 4 when ordered by an individual consumer. This product must ship via ground transport. This product may not be shipped into Los Angeles, San Bernardino, Orange, or Riverside Counties. Plastic-Craft Products reserves the right to substitute Weld-On 4SC for Weld-On 3 or Weld-On 4 when ordered for delivery to zip codes in those counties. Very Fast-Setting Solvent Cement for Bonding Acrylic. WELD-ON 3 is a water-thin, non-flammable cement formulated to quickly develop high strength, clear bonds to many thermoplastic substrates, particularly acrylic. The bond is achieved by first softening the surfaces to be joined and then fusing them together with dissipation of the solvent. The initial bond forms within a few minutes and quickly increases in strength. Substantial strength will be obtained within only a few hours. Under certain conditions, especially with high humidity, a white mark on the plastic (commonly called blushing) may sometimes be encountered. Where a more blush resistant cement and longer open time is required, WELD-ON 4 is recommended. Weld-On 3 Acrylic Adhesive is a water thin, very fast set, solvent type adhesive for acrylics. It also bonds other plastics such as styrene, butyrate, and polycarbonates to themselves. Does not bond to cross-linked acrylics. SUBSTRATE RECOMMENDATIONS : WELD-ON 3? is formulated for cementing acrylic (poly-methyl methacrylate) plastic to itself. It will also form strong bonds with other thermoplastics such as polystyrene, CAB (cellulose acetate butyrate), PETG (polyethylene terephthalate glycol) and polycarbonate to themselves. It is not recommended for cross-linked acrylic.