Using the straight and circular mouldings described in the previous post, the following describes how to cut and secure gypsum mouldings.
Measure the distance of the desired moulding and cut the moulding at a 45 degree angle using a miter box.
Check cut to ensure a 45 degree angle
Mark finish level with an ink-line
Check fit of all mouldings, preferably at the same time to ensure clean joints
Treat the back of the mouldings with a sealer to slow the absorption of moisture
Paint on with brush
Prepare gypsum based bonding plaster
Add methylcellulose to improve workability and delay hardening
Dry mix GL bond and methylcellulose, then add water
Firmly apply a thin coat of GL Bond, then apply in thick globs
Wet plaster, firmly apply a thin coat of GL Bond to the base coat, and then set moulding
First the bottom, then sides
Adjust joints if needed.
Set the circular moulding: In this case, equal spacing on sides and top.
Ensure circular moulding is at the same level as the surrounding mouldings
Check horizontally and diagonally
Imperfections can be corrected with paintbrushes and plaster.
Dip the brush in water and the edge of the gypsum powder, and correct the moulding
10mm for brown and finish coats