Product Description
Bostik 425™ multi-purpose acrylic latex admixture is a high solids acrylic emulsion designed to improve the performance of Bostik Tile-Mate®, Hydroment® Ceramic Tile Grout™ (Sanded), Hydroment® Dry Tile Grout™ (Unsanded), Single-Flex® FS, UltraFinish™ Pro and UltraRamp™ mortar, and jobsite prepared mortar beds.
Product Uses
- Controls hydration rate (curing) of cement mortars and grouts
- Use with thin set mortars to provide adhesion to non-masonry substrates such as plywood, waterproofing and crack isolation membranes and porcelain tile
- Use with cement based tile grouts. Helps to ensure consistent cure results and better color development
- Improve water resistance of grouts, thin sets and mud beds
- Improve flexural and compressive strengths
- Helps prevent cracking grout in wood framed structures
- Use 425 Multi-Purpose Acrylic Latex Admixture to prepare bond coats
- Use in jobsite prepared mortar “mud” beds
Where to Use
- Interior and exterior floors
- Interior and exterior walls
Substrates
- Plywood sub-floors
- Porcelain tiles
- Gypsum board
- Cementious backer boards
- Waterproofing membranes
- Crack isolation membranes
Materials
- Ceramic
- Glazed wall tile
- Quarry

Product Specifications
SKU: | h-ac |
Non-Returnable: | Yes |
Manufacturer: | Bostik |
Warranty: | Limited Warranty |