That’s Top Shield SBR Latex TS-303 - 20ltr jerrycan.
SBR = Styrene Butadiene Rubber Latex. It’s a liquid additive for cement + mortar work.
What it’s used for:
1. Waterproofing - Main use.
Mix it with cement mortar/screed for bathrooms, balconies, water tanks, roofs, basements. Makes the mortar water-resistant so no seepage.
2. Bonding agent / Bonding slurry - “Superior Bonding to Concrete & Plaster” on the label.
Paint it on old concrete before pouring new concrete/plaster. Stops delamination/cracking. Old concrete + new concrete bond like one piece.
3. Improve mortar/concrete - Adds high flexibility so mortar doesn’t crack easily. Also improves strength, adhesion, and chemical resistance.