Product Data Sheet Show all documents

SikaBond® Waterproof PVA Ultra

Waterproof PVA for interior and exterior use as an adhesive and sealer.

SikaBond® Waterproof PVA Ultra is a waterproof vinyl acetate polymer especially formulated for exterior use as an adhesive and sealer. Suitable for brickwork, mortar, render, screed and plaster. It is easy to use and unlike normal PVA it will not re-emulsify when wet.

  • Waterproof formula.
  • Will not re-emulsify when wet.
  • Toughens screeds and mortars.
  • Internal and External use.
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Product Data Sheet Show all documents

Usage

  • Excellent admixture for renders and for toughening floors and screeds.
  • As a primer and sealer before plastering, painting or in tiling applications.
  • As a bonding agent for plaster, cement screeds and render to sounds surfaces.
  • Suitable for brickwork, mortar, render, screed and plaster.
 

Advantages

  • Waterproof formula.
  • Will not re-emulsify when wet.
  • Toughens screeds and mortars.
  • Internal and External use.

Packaging

5 L Jerry Can.

Product Details

Sustainability / Certifications / Approvals

APPROVALS / STANDARDS

Classifed as a D3 bonding agent under EN204.
Product Information

Shelf Life

12 months from date of manufacture when stored according to manufacturer’s instructions in original, tightly closed containers.

Storage Conditions

Store in cool, dry conditions. Between +5 and +25 °C. Protect from frost. Storage outside these parameters will dramatically reduce shelf life.

Density

1.0 – 1.2 g/cm3 @ +20 °C

pH-Value

2 - 4

Application

Application Information

Ambient Air Temperature

Application temperature > +10 °C
Consumption

Consumption

High Suction surfaces, diluted 1 part PVA to 0.5 parts water; 1 litre per 12.65 m2.

Low Suction surfaces, diluted 1 part PVA to 0.5 parts water; 1 litre per 8.43 m2.

As a sealer or primer diluted 1 part PVA to 4.9 parts water; 1 litre per 33.73 m2.

Consumption will vary dependent upon surface porosity.
Application steps

CLEANING OF TOOLS

Clean all tools and any excess SikaBond® Waterproof PVA Ultra with cold, clean water immediately after use.

Documents

FAQ

Is SikaBond® Waterproof PVA Ultra really waterproof?

Yes. Unlike standard PVAs, SikaBond® Waterproof PVA Ultra is specially formulated not to re-emulsify when wet, making it suitable for damp environments and outdoor applications.

How do I apply SikaBond® Waterproof PVA Ultra?

It can be applied by brush, roller, or added directly to cement mixes. Dilution depends on the use – for priming, dilute 1 part SikaBond® Waterproof PVA Ultra  with 5 parts water; for bonding, use 1 part PVA to 0.5 parts water.

What is SikaBond® Waterproof PVA Ultra used for?

SikaBond® Waterproof PVA Ultra is a multi-purpose waterproof bonding agent, primer, sealer, and mortar admixture for both interior and exterior use. It’s ideal for brickwork, plaster, render, screed and concrete surfaces where moisture resistance is required.

Does it work on old concrete or when bonding new cement to old?

Yes. SikaBond® Waterproof PVA Ultra is ideal for bonding new cement, plaster or screed to old concrete surfaces. Just follow the correct priming and bonding steps for the best results.

Can I use it as a primer before plastering or painting?

Yes. Diluted with water, SikaBond® Waterproof PVA Ultra works as an excellent primer and sealer before applying plaster or paint, helping improve adhesion and reduce surface porosity.

What surfaces can I use SikaBond® Waterproof PVA Ultra on?

It can be used on brick, concrete, plaster, screed, mortar, and even tiles or painted surfaces when properly applied. It works well on both absorbent and non-absorbent substrates.

What makes SikaBond® Waterproof PVA different from regular PVA?

Unlike standard PVAs, SikaBond® Waterproof PVA Ultra is formulated to be
water-resistant and won’t break down when re-exposed to moisture, making it reliable for exterior and damp applications.

Can I use SikaBond® Waterproof PVA Ultra outside?

Absolutely. It is designed for both internal and external use, providing durable bonding and sealing even in outdoor environments exposed to moisture.

Can SikaBond® Waterproof PVA Ultra be used as a mortar or screed admixture?

Yes. When added to cement mixes (10–15 litres per 50 kg of cement), it improves strength, flexibility, and water resistance, making it ideal for toughening floor screeds and external renders.

Is it suitable for sealing dusty concrete surfaces?

Yes. When diluted at a ratio of 1 part SikaBond® Waterproof PVA Ultra with 5 parts water, SikaBond Waterproof PVA acts as an effective dust proofer, sealing and stabilising porous or chalky concrete and plaster.