Weldbond Specifications & Instructions
Weldbond as a glue:
Use Weldbond at full strength without diluting. Apply to one surface and press together. Allow to dry thoroughly.
Weldbond when bonding two porous surfaces:
When bonding two porous surfaces, surface sealing can be done prior to adhering for optimal results. Determine if the surfaces are porous by placing a drop of water on the surface. If the water lies on the surface, then sealing is unnecessary. If water soaks in, then you may want to prep the surface by sealing them with Weldbond. Porous surfaces can be primed by mixing one part Weldbond and five parts water, then apply liberally and allow to fully dry. Then spread a thin film of Weldbond on both surfaces. Clamp lightly and let dry.
Weldbond when bonding porous to non-porous materials:
Spread a thin film of Weldbond on both surfaces; place the surfaces together. The longer that it is let to cure, the stronger the bond will be. Weldbond cures by evaporation, and when it is fully cured the bond appears crystal clear.
Weldbond as a sealer:
Mix one part Weldbond with five parts water. This makes a porous surface sealer and primer. Concrete, plasterboard, or any surface that is porous can then be bonded or painted. This can save you a coat of primer.
Weldbond as a general adhesive mix:
For bonding any rough and uneven surface, mix one part Weldbond, with one part water and 4 to 5 parts filler (plaster, tile grout, mortar mix, sand-cement mix).
Weldbond dries chemically in air. You can reduce curing time by allowing it to dry slightly before making the bond. This can reduce the curing time, but might also compromise a bit of Weldbond's strength. We suggest one to three days of curing time for maximum strength.
For maximum performance use Weldbond at temperatures above 10°C (50°F) and on surfaces below 92°C (200° F).
Do not allow Weldbond to freeze when in a liquid state. Store above 10°C (50°F).
Some types of plastic, rubber and cast metals will not produce a bond with Weldbond including polyethylene, unbacked vinyl, PVC, Teflon, polypropylene, vinyl to vinyl, cast iron, cast aluminium and so-called "pot" metals. Note: Do not use when bonding containers designed for use with, or subject to, hot liquids.
Ensure all surfaces are clean. Remove all grease, oil, and dirt. For an optimal results, sand smooth or slick surfaces. Use a rust inhibiting primer before applying Weldbond to iron or steel surfaces.
The longer it sets, the stronger it gets. On porous surfaces, Weldbond will be dry in about an hour, but you can tell it is fully cured and bonded when it becomes crystal clear. It will have have its maximum bond within a few days. The 5:1 sealant dries in about an hour.
Apply Weldbond by squeezing the bottle and utilizing its non-clogging nozzle or apply with a sponge, brush, roller, or spray gun.
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