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Installation Print

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SA650-AGGREGATE BASECOAT is the most technically superior coating for creating colorful distressed plaster surfaces. Time worn walls have an architectural signifacance unto themselves, and when properly rendered create a surface that conveys warmth and luxury. There are several methods of achieving this much desired effect using various coatings and techniques but the SA-650 aggregate basecoat plaster was formulated specifically for this purpose. SA-650 is an all acrylic plaster with a # 72 grit silicate that can be tinted to any color and covers even the most deviated surfaces. The most successful applications involve the use of 3 or more colors of SA-650 trowelled in a combination wet blend method. The technique required to authenticate this finish is unlike the quick- learn monolithic approach of conventional systems and requires the installer to make use of personal style and good color and texture judgement. You will need the SA-650, various tints, a pool trowel, a plasterers hawk, a 6" broad knife, and a spritzer bottle with water.
 This is the finished effect. The clay color is dominant and the two other colors are wet blended with the clay.Take note of the natural composition shown here. Stay random!  (this color combo is named aztec ruins)
 Choose the colors and tint them into the SA-650 (use seperate containers) . Now take the darkest of your colors and trowel this across the entire surface. An even monolithic coat is all that is required at this stage. Allow this coat to fully dry (approx. 4 hrs.) You are now ready to perform the finishing stage. All colors chosen are utilized in this stage and are applied in a wet blend system. Excellant results have been achieved by first skip-trowelling the darkest color onto the surface, covering approx. 10 sq. ft. then take a second color and trowel it into the wet plaster randomly, take a third color and  trowel it also into the wet plaster.Hold back any other colors at this point and wait for an appropriate time to introduce them. NOTE: Pressing lightly at this stage will result in minimal blending and likewise pressing harder will result in more blending. Also authentic texturing can be created at this wet stage by pushing the full flat face of the trowel into the wet plaster and then quickly removing it, this will result in a TEAR-OUT as we call it. A tear out creates a unique opening in the surface that cannot be rendered any other way. It is important to water spritz the surface on a regular basis to trowel through it and sit evenly on the surface.

The water spritzing controls a visual snag that will appear on the surface as an open unwanted tear, caused by trowelling through semi-dry product (look for these as they have no place in the final appearance). Deal with these immediately with a light water spritz followed by a light stroke from your broadknife.They will disappear before your eyes.The same can be said about keeping an open edge on the material. When you are continuing the finish, in order to prevent a cold joint you must maintain an edge that has not begun to dry, the water will control this. NOTE: You cannot re-open a cold edge (one that has dried). But do not be discouraged because this finish allows for texture variations. You can come back into a cold joint and build over it,  therefore repairs to this texture are easy because the effect has a definitive relief aspect to it. Some colors can be applied cold at a later time (for added drama) as long as the finish still looks realistic.

As previously mentioned this finish is definately in the full control of the applicator. There is no present source with which to obtain training because no two people will render this finish in the same manner. Practice and trial is compulsory here. You may never use this technique, but in the 15 years that I have been applying this finish, this  texture has been selected 7 out of 10 times.