Evo-Stik Contractors PVA - White - 5kg
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Product Information
Full details
The Evo-Stik Contractors PVA (5kg) is a professional-grade plaster bonding agent designed for contractors and DIY enthusiasts to prime and seal porous surfaces, ensuring reliable plaster adhesion on interior walls and ceilings. Its key benefit is regulating substrate porosity, which prevents patchy drying, reduces the risk of weak adhesion, and minimizes cracking. A potential caveat is that its effectiveness depends on correct dilution for priming versus neat application as a tack coat.
All features
| Colour | White |
|---|---|
| Model Part Number | 30633778 |
| Brand | Evo-Stik |
Extended Product Information
FAQs
What is the coverage rate of Evo-Stik Contractors PVA?
The coverage rate is approximately 6-14m² per litre, depending on the application thickness and the absorbency of the substrate.
Can I use this PVA for exterior applications?
The product description focuses on interior applications for plaster bonding. It is not explicitly recommended for exterior use without further manufacturer guidance.
How do I dilute the PVA for priming?
The dilution ratio can vary, but a common starting point for priming is 1 part PVA to 4 parts water. Always test on a small area first if unsure.
Can I use this on painted surfaces?
It is generally suitable for sealing dusty or chalky backgrounds, which can include previously painted surfaces that have been lightly abraded. However, it is not designed to adhere to glossy or intact paint films.
How long does it take to dry?
Drying times vary depending on temperature, humidity, and application thickness. Typically, it dries clear within 1-2 hours, but it's best to allow longer before applying plaster, especially in damp conditions.
What is the difference between using it diluted and neat?
Diluted (e.g., 1:4) it acts as a primer to regulate porosity and seal surfaces. Neat, it acts as a tack coat, providing a strong adhesive layer for improved bonding, often used before applying plaster or tiles in specific situations.
Can I paint directly over dried PVA?
Yes, once fully dry and clear, you can apply emulsion paints and other decorative finishes over the treated surface.
Troubleshooting
Plaster cracking or crazing after application
This may indicate the PVA was not diluted correctly for priming, or the surface was too absorbent. Ensure proper dilution ratios are followed and apply a second coat if necessary. Allow adequate drying time before plastering.
Poor adhesion of plaster or subsequent coatings
The surface may not have been adequately prepared (e.g., still dusty or greasy) or the PVA was applied too thinly. Ensure the surface is clean and dry, and apply PVA evenly. For very porous surfaces, a second coat might be needed.
PVA remains sticky or tacky after drying
This can occur if the PVA was applied excessively thickly or in very humid conditions. Allow more time for drying, ensuring good ventilation. In most cases, it will fully cure over time, but excessive application should be avoided.
White residue visible after drying
This is usually a sign of the product not drying fully, often due to over-application or poor ventilation. Ensure adequate drying time and ventilation. If minor, subsequent paint coats should cover it.
Pros and Cons
Pros
- Enhances plaster adhesion on a wide variety of porous and non-porous surfaces.
- Regulates porosity to prevent uneven drying and cracking.
- Stabilizes dusty backgrounds for a more reliable plaster finish.
- Versatile use as a primer (diluted) or tack coat (neat).
- Dries clear, maintaining the aesthetic of the finished work.
- Economical with good coverage rates.
Cons
- Requires correct dilution for optimal performance; incorrect mixing may lead to issues.
- Primarily for interior use, not explicitly stated for exterior applications.
- Requires adequate ventilation during application and drying.
- Not a substitute for structural repairs; surface preparation is still key.
Setup, Compatibility & Care
Setup: The product is ready to use, requiring dilution for priming or application neat as a tack coat. Ensure surfaces are clean, dry, and free from loose debris before application. Apply using a brush or roller, working in well-ventilated conditions.
Compatibility: This PVA is compatible with a wide range of common construction materials including timber, plywood, blockboard, chipboard, fibreboard, expanded polystyrene, polyurethane foam, insulating board, brick, concrete, plaster, stone, and slate.
Care: Store the product in its original container in a cool, dry place, away from direct sunlight and frost. Ensure the container is tightly sealed when not in use. Clean application tools immediately after use with water. Once dry, the PVA is difficult to remove.