Weldbond offers superior bonding strength. It's ideal for cementing
joints to walls, floors and ceilings, including fillets, tiles,
slates and pointings. Weldbond also adds great strength to plaster
work over glazed tile and painted surfaces.
Preparation for all plaster work: Clean all surfaces
thoroughly. Glossy (painted) surfaces must be sanded. Porous surfaces
must first be primed.
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 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,
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, leveling 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 vapor 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. |