BondPro SBR may be applied by brush or roller as required:
- As a Plaster bonding agent:
Reduces hacking and keying and will provide an adhesive or mechanical key to receive plaster or render coats of gypsum, lightweight gypsum, or anhydrous plasters, plastering onto tiles.
For gypsum, lightweight gypsum and anhydrous plasters seal as required and prime with a solution of 1-part BondPro SBR to one part water and allow to become tacky. Then plaster straight onto the tacky BondPro SBR as per the normal method.
For heavier renderings and cementitious toppings seal and prime as above and then prepare a key coat by mixing 1 part Portland cement, 1-part clean washed sharp sand, gauged to a stiff consistency with 1-part BondPro SBR to 3 parts clean water. Apply this to the tacky priming coat to an average thickness of 6 mm 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 prior to applying render.
For plastering onto glazed tiles, to ensure a satisfactory bond a mechanical key should be provided by light peck hammering prior to sealing, priming and plastering as above.
2 As a General adhesive:
Bonds asbestos. bricks, carpet, concrete, earthenware, glass, laminated plastic, leather, linoleum, plasterboards, polystyrene, renders, roofing felt, stone, textiles, tiles and wood.
After surface preparation, apply a thin film of BondPro SBR over both faces and allow to become tacky (20 to 30 minutes depending upon temperature). Bring the surfaces firmly together, position as required, wipe of any excess and allow to set for 24 hours. Do not clamp tightly as the BondPro SBR may be squeezed out.
Note: BondPro SBR will not bond polythene, PVC or rubber
- Bonding new concrete to old:
Ensure that the substrate is stable, sound thoroughly clean and free from oil, grease and any loosely adhering material. Apply a sealing coat of BondPro SBR diluted with 4 parts of clean water and allow to dry. Apply a bonding coat of BondPro SBR diluted with an equal volume of water and lay the new concrete while this coat is still tacky. To ensure maximum bond strength, add 5 litres of BondPro SBR per 100kg bag of cement.
- For repairs to concrete:
Prepare and seal the surface as required, apply a priming coat of 1-part BondPro SBR to 1 part water and allow to become tacky. Using the same sand or fine aggregate as in the concrete to be repaired, prepare a stiff cement/sand mix in the proportions 1:2 (or leaner) gauged with 1-part BondPro PVA to 3 parts clean water. Compact firmly and level out with minimum trowelling.
- Repairs to Natural or Reconstructed Stone:
Prepare and seal the surface as required and apply the prim- ing coat as above. Prepare a stiff mix comprising of Portland cement with original aggregate in as lean a mix as possible 1:6 (or leaner) consistent with the strength requirements gauged with 1-part BondPro SBR to 3 parts clean water. Compact firmly and level with the minimum of trowelling.
Note: Resurfacing does not normally call for high strengths.
- For repairs to concrete and granolithic floors:
Prepare and seal the surface as required. Apply the priming coat of 1-part BondPro SBR to 1 part water, brush well into all crevices and allow to become tacky. The priming coat must never be allowed to dry, if it does re-prime and proceed only when tacky.
Prepare a mix of 1 part of Portland cement to 2.5 parts of clean washed sharp sand, gauged to a stiff consistency with 1-part BondPro SBR to 3 parts clean water. Then proceed as per the particular application as detailed below:
Repairing Cracks and Holes in Cementitious Floors: Place the mix onto the tacky prime coat, compact firmly and level out
to a smooth finish with minimum trowelling. Deep holes and cracks should be filled with conventional concrete onto the tacky priming coat to within 6mm of the surface and “topped” off to above specification whilst the ordinary concrete fill is still green.
Resurfacing of worn concrete and granolithic floors: Place the mix onto the tacky sealing coat and trowel into the surface using existing exposed aggregate as level thus replacing mortar lost by wear. Treat deep indentations or holes as per above.
Levelling of worn star treads: Place the mix onto the tacky priming coat, compact firmly and level out to a smooth finish with the minimum of trowelling. To impact a nonslip finish to the stair tread, a piece of hessian should be placed onto the newly filled area soon after trowelling and lightly tamped to leave an impression of the hessian.
- As a surface sealing coat:
To seal highly porous and dusty, friable concrete or granolithic subfloors, apply 2 coats of BondPro SBR diluted at the rate of 1 part BondPro SBR to 4 parts water and a final coat diluted 1 part BondPro SBR to 3 parts water. Allow each coat to dry before proceeding. On less porous floors, the first coat may be omitted.
- As a bonding agent for tiles:
Wood, block, cork, lino and acoustical tiles: Use
BondPro SBR as a general adhesive. If the surface is uneven, the adhesive should be filled as described below under “Polystyrene Tiles.”
Ceramic, concrete, quarry, clay and terrazzo tiles: Seal with a solution of 1-part BondPro SBR 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 BondPro SBR to 1 part water. Whilst this is still wet or tacky apply the sand and cement bedding to the base and bed the tiles.
Polystyrene tiles, plaster board and acoustic board: Prepare and seal the surface as required, then using a suitable filler such as plaster, cement, fine sand or sawdust, make a paste with a solution of 1-part BondPro SBR to 1 part water. Apply this mixture as an adhesive coat to the tiles and surface to be bonded.
- For bonding screeds from 10- 35mm:
The aggregate blend must have a diameter appropriate to screed thickness: a maximum diameter, therefore of 1/3 to 1/4 of the thickness of the screed with a limit of 8mm. Do not wait for the slurry to dry, cast fresh screed on to fresh slurry. Prepare the surface & apply a priming coat of 1-part BondPro SBR to 1-part water, brush well into all crevices and allow to become tacky. The priming coat must never be allowed to dry, if it does then the surface must be reprimed.
Prepare a key coat consisting of 1 part Portland cement to 1-part clean sharp sand gauged to a stiff consistency with a solution of 1 part BondPro SBR to 3 parts water. Spread over the area whilst the priming coat is still tacky to an average depth of 6 mm then stipple with a stiff brush to form a mechanical key i.e: as rough a surface as possible. Allow to harden thoroughly and check for adhesion prior to laying the granolithic topping.
- As a primer for overcoating bitumen with oil-based paints:
To prevent bitumen coatings bleeding through subsequent films, they may be primed with BondPro SBR diluted with equal parts of water which will form an efficient barrier and may then be safely covered with most oil-based paints.
- Soil and sand stabilization:
For average stabilization and dust control, mix 1 part of BondPro SBR to 5 parts clean water and spray immediately on to the surface of the soil or sand. Penetration depth will vary according to the type of soil but will be at least 12mm. Coverage is approximately 5.0 litre/m²
High temperature working:
At ambient temperatures above 35°C, the material should be stored in the shade and cool water used for mixing.
Curing:
BondPro SBR mortars, toppings and renders are cement based and correct curing is important. In common with all cementitious materials, they must be cured immediately after finishing in accordance with good concrete practice. Moisture cure for 24 hours and then allow to dry out slowly. In harsh drying conditions, supplementary curing with damp hessian or polythene sheeting is strongly recommended.
Recommendations:
- BondPro SBR mortars, toppings and renders should not be applied when the ambient temperature is lower than +5°C or higher than +50°C
- Neither should they be exposed to moving water during application. Exposure to heavy rainfall prior to the final set may result in surface scour.
- Do not apply BondPro SBR modified mixes to a Bonding Slurry that has been allowed to dry out fully.
- Always use fresh, cool cement and sharp, clean, well graded aggregate, free of excessive fines.
- Keep mixing time to a minimum.
- Avoid using excessive water.
- Trowelling should proceed with the work. Do not over trowel and avoid re-trowelling. Protect from too rapid drying out prior to trowelling.
- Lime (more than 10% cement weight), air entraining agents and masonry cement must not be used in conjunction with BondPro SBR
Do not overdose BondPro SBR as strengths may be adversely affected.
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