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