Modifying and Securing Gypsum Mouldings

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
 Lastly, top.
 Check joints
 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
 After correction
 10mm for brown and finish coats

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