Gypsum Joint Compound is composed of Portland cement, fine fillers, bonding chemicals, and high-performance additives. It is supplied as a dry powder in pre-weighed bags ready to use on-site, and only requires the addition of clean water to produce a cohesive mix. Gypsum Joint Compound is ideal for levelling, finishing, and filling gypsum board joints. Gypsum Joint Compound can be generally applied in layers that are 1 to 5mm thick.
The surface should be sound, clean, and free from loose material, grease, laitance, dirt-curing compounds, etc.
For mechanical mixing, add 7.5-8.8 litres of water to the mixing container for each 20kg bag of Gypsum Joint Compound. Mix using an automatic plaster mixer or a low-speed electric drill fitted with a suitable paddle until you achieve a uniform, lump-free consistency.
Leave the mixture to stand for 10 minutes, then briefly remix it without the addition of water.
Mix small batch quantities manually for approx. 1-2 min, or until achieving a homogenous mix.
When required, add 0.5 litres of Vetobond AB432 to the mixing water and adjust the water requirement for each 20kg bag accordingly. Follow the same mixing procedure.
Use the material within 2-3 hours. Do not add water once the mixed filler mortar begins to stiffen or harden.
Generally, apply Gypsum Joint Compound in a single coat. Spread the Gypsum Joint Compound to the area with a wide spatula while filling and pressing firmly into the joints.
Place joint tape over the joints with a small spatula, spread the excess compound over the joint tape, and level it smoothly to the surface while edging out to the sides. After hardening, smooth rub the joints to the desired finish.
Apply Gypsum Joint Compound manually as a skim coat on top of the gypsum board to achieve a uniform soft surface layer.
Gypsum Joint Compound sets and cures on its own at room temperature.
Clean all tools with water immediately after finishing. Clean hardened materials mechanically.