Vetobond PB433

The surface must be sound and thoroughly cleaned before Vetobond PB433 is applied. All loose particles, old mortar, laitance, dirt, paint, etc., must be removed by brushing with a stiff /wire brush or other suitable means. Fungi or Algae should be scoured away using hypochlorite type bleach or proprietary fungicidal solution and then washed with water. Timber and composition boarding must be dry and free from wax, polish, and paint, etc. Remove all traces of oil and grease with an industrial-grade chemical degreaser or another suitable degreasing agent.

On vertical surfaces, where the paint cannot be removed, it is advisable to peck-hammer, except where gypsum plasters are to be applied. This ensures a bond between Vetobond PB433 and the structure and prevents failure due to lack of adhesion between the paint film and the substrate.

Porous surfaces should be sealed with a solution of 1 part Vetobond PB433 without dilution. If the surface is less absorbent, then dilution of up to 1 part PB433 to 10 part clean water is recommended. Site trials are highly recommended before dilution.

Breeze, foam, slag, and other lightweight building blocks are exceptionally absorbent and may require wetting down before sealing.

1. As a plaster bonding agent: For Gypsum, Lightweight gypsum, and Anhydrous plasters, seal as required and prime with a solution of 1 part Vetobond PB433 to 1 part water and allow to become tacky. Then plaster straight onto the tacky Vetobond PB433 in the normal way. 

2. For heavier rendering and cementitious toppings: Seal and prime as above and then prepare a key coat by mixing 1 part ordinary Portland cement, 1 part clean washed sharp sand, gauged to a stiff consistency with 1 part Vetobond PB433 to 3 parts clean water. Apply this to the tacky priming coat to an average thickness of 6 mm (¼ inch) and stipple with a stiff brush or otherwise roughen the surface to provide a good mechanical key. Allow to harden and dry thoroughly. Test for adhesion before applying to render. 

3. Ceramic, concrete, quarry, clay, and terrazzo tiles: Seal with a solution of 1 part Vetobond PB433 to 5 parts water. Brush well into the surface and allow to dry. Before bedding tiles in sand and cement, give the floor and the base of the tiles a further coat of 3 parts Vetobond PB433 to 1 part water. Whilst this is still wet or tacky, apply sand and cement bedding to the base and bed the tiles. 

4. Polystyrene tiles, Plasterboard and Acoustic board: Prepare and seal the surfaces where required. Using a suitable filler such as plaster, cement, fine sand, or sawdust, make a paste with the solution of 1 part Vetobond PB433 to 1 part water. Apply this mixture as an adhesive coat to the tiles and surface to be bonded.