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Vitcas PVA Sealer - an all-in-one solution carefully engineered to enhance the performance of your Vitcas Heat Resistant Products. This single-part, water-resistant, polyvinyl acetate-based emulsion is the perfect companion for Vitcas Heat Resistant Tile Adhesive, Heat Resistant Plaster, Fireplace Render, High Temperature Plasterboard, and other heat-resistant products.
Versatile and high-performing, Vitcas PVA Adhesive Sealer serves as an all-purpose solution. Its multi-faceted functionality allows it to seal porous substrates, preventing the absorption of active components from applied products, and to function as a bonding agent, bridging a variety of materials. Additionally, it acts as a robust dust barrier on surfaces like cement and plaster, markedly enhancing adhesion performance.
Key Features
High Viscosity - Crafted with a thick, high-viscosity formula for superior hold and excellent bonding.
Water Resistance - Provides effective protection against water, improving the durability and performance of heat-resistant finishes.
Rapid Drying - Dries quickly, making application more efficient and convenient.
Multiple Uses - Suitable as an adhesive to seal porous surfaces and prevent absorption of active ingredients, a dust proofer for fireboards, a bonding agent for ceramic tiles, and an adhesion enhancer for other mortar-based surfaces.
Instructions for Use
Ensure the surface is clean, dry, and free from dust or loose material.
Apply Vitcas PVA Sealer undiluted to porous surfaces such as masonry, high-temperature boards, construction boards, etc.
Apply the heat-resistant product once the PVA Sealer becomes tacky to the touch. Note: Drying time may vary depending on temperature and humidity.
For external applications, ensure the substrate is completely dry before use.
Always test a small area first to ensure compatibility with the surface.
Why do porous surfaces need sealing before applying heat-resistant products?
Answer
Porous masonry, fireboards and construction boards can absorb active components from products applied over them, which may reduce adhesion. VITCAS PVA Adhesive Sealer closes the porous surface and creates a more suitable bonding layer. Apply it undiluted to a clean, dry substrate that is free from dust and loose material.
Question
Should VITCAS PVA Adhesive Sealer be diluted?
Answer
No. The VITCAS PVA Adhesive Sealer is supplied ready to use and should be applied undiluted to suitable porous surfaces. Adding water could prevent the high-viscosity emulsion from sealing the substrate as intended. Apply an even coating after checking that the surface is clean, dry and compatible with the product.
Question
When can the subsequent product be applied over the adhesive sealer?
Answer
Apply the chosen heat-resistant product when the PVA adhesive sealer coating has become tacky to the touch. Do not rely on a fixed waiting time because drying can vary with temperature and humidity. Monitor the treated surface and continue with the next stage once the correct tacky condition has developed.
Question
Can the PVA sealer be applied to a damp surface?
Answer
No. The surface must be clean and dry before the sealer is applied. For external applications, the substrate must be completely dry. Remove dust and loose material, allow any remaining moisture to dry and test a small area first to confirm compatibility before treating the full surface.
Question
Must both the tile and substrate be sealed?
Answer
When using VITCAS HRTA Heat Resistant Tile Adhesive, the VITCAS PVA sealer must first be applied to both the surface being tiled and the back of the tile. This helps prevent porous materials from absorbing active components from the adhesive. Apply the HRTA tile adhesive while the sealed surfaces are still tacky.
Question
Is VITCAS PVA Adhesive Sealer required before VITCAS FR fireplace render and VITCAS HRP heat-resistant plaster?
Answer
Yes. VITCAS specifies that PVA Adhesive Sealer must be used before applying both VITCAS FR Fireplace Render and VITCAS HRP Heat Resistant Plaster. It seals the porous substrate and creates a suitable bonding layer. Apply it undiluted and continue with the render or plaster while the coating remains tacky.
Question
Should PVA be used when fixing boards with HB60 Hydraulic Bonded Adhesive?
Answer
Yes. VITCAS recommends using its PVA sealer when HB60 is used to fix VITCAS fireboards. The PVA coating helps control absorption and acts as a dust proofer on the board surface. Make sure the board is clean and dry, then apply the PVA sealer before using the HB60 hydraulic bonded adhesive.
Question
How much area will one litre of PVA adhesive sealer cover?
Answer
The coverage is approximately 3 m² per litre. Actual consumption may vary according to the porosity, texture and condition of the surface, with highly absorbent or uneven substrates potentially using more material. Measure the area and inspect the substrate before calculating how many one-litre containers are required.
