Master of Plaster
Finishing Systems, Inc.
Basecoat Plaster
General Requirements:
Master of Plaster basecoat may be used over most clean sound substrates without the use of any bonding agents.
Masonry - Cement block, brick, poured concrete, cement stucco, cement board.
Gypsum Drywall – Sheetrock, mildew resistant type “XP” sheetrock, fire code type “X”
fire code type ‘’C’’ water- resistant (greenboard), blueboard.
All gypsum drywall substrates must be installed according to manufacturers specifications and instructions.
Existing Plaster Substrates – Master of Plasterwas originally developed for use over existing plaster substrates in historically significant structures. Master of Plaster basecoat can be applied over surfaces painted with oil, latex, or acrylic paints. Do not use over calcimine.
Application:
Master of plaster is best applied using a hawk and trowel. Always follow good plastering practices.
When applying Master of Plaster basecoat over cement block, brick, or poured concrete, first apply a layer of “ Structolite “ or similar product according to manufacturers instructions to insure joints and form lines do not show through. When “ Structolite “ has set apply a thin uniform coat of Master of Plaster basecoat over entire surface. Allow to set overnight.
When applying Master of Plaster basecoat over cement board or gypsum drywall substrates all joints and screw heads must be taped using self adhesive mesh tape. Use USG 800 corner bead on all outside corners. Install according to manufacturers instructions. Apply self adhesive mesh to flanges. Rolled edges and joints should be taped with 4” tape and the joint filled with Master of Plaster basecoat and leveled with a good featheredge or mitre rod. Check joints when dry and refill any low areas with Master of Plaster basecoat. If drywall surfaces have been taped and bedded with a joint compound material the surface should be primed prior coating with Master of Plaster basecoat. Any good quality primer will work. Apply a thin coat of Master of Plaster basecoat over entire surface. Allow to dry overnight. Apply a second thin coat of Master of Plaster basecoat over entire surface. As material starts to set re-trowel to remove any trowel marks or imperfections. Using a plant mister or pump-up sprayer a small amount of water can be used to smooth plaster. As you progress across the wall or ceiling surface keep edges of plaster wet to help with feathering in. Keep applying small amounts of water and troweling until all trowel marks are removed and surface is smooth.
When applying Master of Plaster basecoat over existing plaster or cement stucco remove any spauling paint, and crumbling, or damaged plaster back to lath. If lath is damaged replace with similar material. Where damaged material has been removed repair with “Structolite” or similar material. Mix and apply according to manufacturers instructions. Always soak the edges of the existing plaster adjacent to the repairs with liberal amounts water to keep the repair from shrinking and cracking. Apply 6’’ wide self-adhesive mesh tape over the joint where the patch meets the existing plaster. Make sure both the old and new plaster are taped. Fill any large cracks with Master of Plaster basecoat and scrape level with adjacent surfaces and apply self-adhesive mash tape. It is not necessary to open cracks. If large scale mapline cracking is present cover entire surface with self-adhesive mesh (available from Master of Plaster Finishing Systems, Inc. in 36” wide rolls). Apply a thin coat of Master of Plaster basecoat over entire surface. Allow to dry overnight. Gently scrape and remove any trowel marks. Apply a second coat of Master of Plaster basecoat over entire surface. As material begins to set re-trowel to remove any trowel marks and imperfections. Using a plant mister or pump up sprayer a small amount of water may used to help smooth plaster. As you progress across the wall or ceiling surface keep edges of plaster wet to help with feathering in. Keep applying small amounts of water and re-troweling until all trowel marks are removed and surface is smooth.
Finishcoat Plaster
Application:
Master of Plaster finishcoat is used when a smoother finish is required than can be achieved using basecoat alone.
Allow second coat of Master of Plaster basecoat to dry overnight. Apply a thin coat of Master of Plaster finishcoat over entire surface. Working on small areas apply a thin coat of finish. As material begins to set re-trowel to smooth and remove any trowel marks. Keeping edges wet move to next area and apply feathering the edges together. Smooth and re-trowel to remove any trowel marks. Return to the first area where finish was applied wet and re-trowel to polish. The more it is troweled the smoother and shinier it will become. Work your way across the entire wall or ceiling surface applying material and polishing. Keep troweling until the desired sheen is achieved.
Venetian Plaster
Description:
Venetian Plaster is the common generic term for tinted plaster. Venetian Plaster is always a mottled finish with a high polish. True Venetian Plaster is lime based. Master of Plaster produces the highest quality pre-mixed lime based plaster available. With over 2,000 mineral based tints manufactured specifically for the Master of Plaster system, Master of Plaster is also the producer of the highest quality lime based Venetian Plaster. Master of Plaster tints are manufactured by B&J colorants, of Marietta Ga. Tints are based on the Benjamin Moore color spectrum.
Application:
Tint Master of Plaster base and finish coats to the desired color, and apply as described above. On wall surfaces it is suggested that all three coats of plaster be tinted to eliminate any white marks showing through should it get scratched over time. Ceilings are far less likely to get scratched so the first coat does not need to be tinted. To achieve the desired mottled effect mix the Master of Plaster basecoat two different shades of the same color. When applying, put equal amounts of each color on the hawk at the same time. Using your trowel take some of each color from the hawk and apply to the wall or ceiling surface. As the material is worked and smoothed the colors will start to blend. Do not overwork or over wet the material. Tint Master of Plaster finish several shades lighter than the base and apply as described above.
Outside corners should not have cornerbead, otherwise there will be a gray line on all the corners. Outside corners need only to be wrapped with self-adhesive mesh tape. When applying the base and finish coats allow them to go past the corners and when dry simply slice them back with the edge of the finishing trowel or a sharp broadknife. Master of Plaster will produce a hard sharp edge. This technique is also useful if the master of Plaster is to be left unpainted.