To make a sturdy plaster bonder: Use Weldbond straight from container or dilute 1 part Weldbond with 3 parts water. It gives extremely high adhesive strength to all types of plaster— cement, or finishing plaster— as long as surfaces are clean and structurally sound. Plaster keying: Apply the 1-part-Weldbond-3-parts-water mix with a pump type sprayer, roller, sponge, or brush and proceed to plaster while adhesive is still tacky. Porous surfaces must be primed with a solution of 1 part Weldbond, 5 parts water and allowed to dry.

To plaster over non-porous surfaces, painted surfaces and glazed tiles: Thoroughly clean surfaces. Glossy painted surfaces must be sanded. Apply concentrated Weldbond to surface; plaster it while still tacky.

To bond gypsum board: First seal porous surface with 1 part Weldbond with 5 parts water and allow to dry. Bond this material to any surface using concentrated Weldbond. If the surface is uneven, use a plaster slurry to take up the unevenness. To make the slurry, add plaster or cement to Weldbond to form a thick paste.

Gypsum board to foam plastic to concrete: Make a thick paste by adding Portland cement to 1 part Weldbond, 1 part water. Apply to surface in daubs no smaller than 2" in diameter, 16" apart. Place each sheet into position using a wood shim and mallet, levelling as you go. If drying conditions are poor, increase the paste's tackiness by reducing the water content and/or by using ready-mix mortar instead of Portland cement.

Strapping-Furring: Seal any porous surface to be strapped with the sealing mixture. Acts as a vapour barrier. Next, mix 1 part Weldbond with 1 part water. Add sand-mix cement or Portland to obtain a thick, workable mixture. Apply along full length of strapping or by using daubs every 6" to 8". Tap into position and level as you proceed.

Sand and cement: To render over glazed tiles and painted surfaces, sand first. Clean surfaces, apply concentrated Weldbond and allow to dry. Next, apply a further coat of concentrated Weldbond and render up while still tacky. Note: when using this method over painted surfaces, the bond achieved will depend on the paint holding the weight of the rendering.