Multi-purpose PVA adhesive for various substrates

Application

Proper application of SpECbond PVA is crucial for achieving optimal results. Below are detailed instructions on how to prepare surfaces and use SpECbond PVA for various purposes:

Preparation
To achieve effective adhesion, thorough preparation is required. Ensure the removal of flaking and cracking paint, unsound plaster, oil, grease, and friable matter to provide a stable substrate. Highly absorbent surfaces such as concrete, foam, and slag blockwork may require pre-wetting before applying SpECbond PVA.

For Use as an Adhesive
When bonding wood to wood, apply a thin coat to one face only and press together firmly. On large surface areas, especially with laminated plastic, clamping or weights may be required for up to 24 hours. Very porous surfaces will need to be primed with 1 part SpECbond PVA diluted with 3 parts water and allowed to dry before proceeding with the adhesive operation.

For Use as a Plaster, Cement/Sand Render & Screed Bonding Agent
For most surfaces, no mechanical hacking or keying is required before applying gypsum plaster. Mix SpECbond PVA with an equal part of water, apply to the prepared substrate, and allow it to become tacky before plastering in the normal manner. For heavier rendering using sand/cement systems, seal and prime as above but employ an intermediate bonding slurry prepared by mixing 1 part ordinary Portland cement with 1 part SpECbond PVA to 3 parts water. Apply the slurry to the still tacky primer with a stiff brush to achieve a rough surface or stippled texture. Allow to harden, then check adhesion to the substrate before applying the rendering.

For Use as an Admixture in Cement/Sand or Granolithic Screeds
Incorporating SpECbond PVA allows for reduced thickness floor screeds to be laid without setting out bays. The ability to lay at reduced thickness helps address unacceptable differences in levels (between 9 to 19mm). Areas subjected to light traffic should be primed as recommended and screeded with a mix of 3 parts sharp sand, 1 part cement, gauged with 8 liters of SpECbond PVA per 50 kg of cement. When heavy traffic is anticipated, use a mix of 1 part sand, 1 part cement, and 2 parts granite (6 to 3mm), gauged with 10 to 15 liters of SpECbond PVA per 50kg of cement. Mix this type of screed semi-dry, never overwet. Lay the screed on a tacky bonding coat, tamp, and trowel to a smooth finish.

For Use in Repairs to Concrete
Prepare damaged or worn concrete as recommended, cutting back perimeter edges to minimize the necessity for feather-edging. Prime with an equal part mixture of SpECbond PVA and water, and repair while the primer is still tacky. The repair mix should consist of 1 part cement and 2 parts sand gauged with a mixture of 1 part SpECbond PVA to 3 parts clean water. Compact firmly but do not over-trowel.

Curing
Cure using a suitable curing agent such as SpECcure WE.

Equipment Cleaning
Clean equipment and tools with water immediately after use.