Spray Coat is a ready to use, co-polymer modified resurfacing compound especially formulated to bond to almost any pours concrete surface. Due to its high strength and easy workability, Spray Coat is perfect to repair rain damaged slabs, scaling or dusting concrete, low spots, chipped or damaged steps and curbs as well as facing foundations. Spray Coat can be applied from a feather edge up to 1/2” thick. Spray Coat can be broom, sprayed or trowel finished.
Spray-down concrete systems offer a wide array of finish options. Usually they are sprayed evenly onto concrete with an air-powered hopper gun, but they can also be applied as a splatter coat to create a textured, slip-resistant surface or "knocked down" with a trowel to create a smoother finish. This system incorporates a cement modified coloured mortar. It can be patterned using stencils or filament tape over existing strong, stable and leveled concrete surface. It is versatile and easy to apply. They are very similar to Microtopping in that they are thin, but differ in that they usually contain more sand and provide a rougher, slip resistant & grittier finish.
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Where to Use
Using a 5-Gallon pail, mix 1 ½ Gallons of clean water with 1 Bag of Renew-Crete Spray Coat. Mix thoroughly for 2 minutes using a mixing wand on an electric drill. Proper consistency is that of thick gravy. Allow to stand 5 minutes to allow polymer to activate, re-mix before application adding a small amount of water to retemper if necessary. Always add the Spray Coat bag mix into the water as mixing.
APPLICATION: SKIM OR BASE COAT
A base or skim coat is used to color or level your concrete surface prior to applying the finished texture. This coat is applied about 1/16 Th of an inch thick either with a squeegee or a steel trowel. This coat should be applied over a damp (no standing water) surface to slow the set slightly. Allow this application to dry before proceeding (about 6-8 hours). Remove any trowel or squeegee marks by lightly sliding a floor scraper over the surface. Blow, shop vac, or sweep off debris. When you’re done spreading out your base coat, take a margin trowel and bevel the edge to make sure that no clumps of material hang over the end of the slab. If that’s not taken off, it will look sloppy and will eventually chip off.
PATTERNS: TAPING AND STENCILS
Taping: Commonly ½” or ¾” Strapping tape is used to create most large tile and stone patterns as well as borders. The tape should be applied to a dry base coat or clean concrete surface.
Apply all the tape in one direction first, then follow with the cross direction. Allow at least 6” to extend over the slab for easy removal. Apply texture and remove tape when material is dry about 1-2 hours. If your tape is not sticking, it’s usually that there is some moisture in the slab.
Stencils:There are 2 common types of stencils, paper disposable and sticky backed paper disposable. Renew-Crete currently only offers poly coated paper as these are the only $.20 per square foot and easy to use. They are available in a variety of brick, stone and tile patterns. When applying the stencil, make sure to apply with the inside of the roll towards the ground so it will not curl on you. Align your stencils and if not sticky back type, hold in place with a small pea size of Blue Tack every few feet. The stencil does not have to be flush with the ground, as long as you make sure to spray straight down; material will not get under the stencil even if the stencil is 1/8” up off the ground.
Apply texture by shooting straight down, when dry (about 1-2 hours) remove stencils
The textured surface is applied or shot with a hopper gun.
Keep these points in mind when spraying concrete:
1. Most models have 3 or more interchangeable tips (orifices) these are used to achieve different textures, the smaller the tip, the finer the spray.
2. The fine spray (smallest) is for color coverage and the larger spray is for heavy knockdown texture.
3. The air pressure required will be between 15-30 psi
Shoot the material downward in a circular motion slightly overlapping with each pass, the previously sprayed area. Wearing cleats or spikes walk over the freshly shot area and lightly trowel with a pool trowel. Trowel in one direction, with an arched type sweep. It’s recommended that you have the same person spray for the entire job and the same person do the knock down – everyone has a slightly different style and it probably will be noticeable if you have people switch tasks midway through the job. Only apply enough texture material that can be troweled before it sets up.( roughly 100 sq. ft at a time) – don’t let the guy who is spraying get too far ahead of the guy doing the knock down. When you have completely textured the area, before removing any stencils or tape, walk over to check for any light or inconsistent areas retexture if needed.
If you are not using a colored sealant, we highly recommend you use one or two highlight colors. This makes the texture look more natural and it confuses the eye against irregularities in the spraying. If the mix is slightly wetter at from one batch to the next, it will be a noticeable when you spray it down. Adding the highlights make sure those variations are not easily picked up by the eye.
After the material has dried,( about 1-2 hours), remove the tape or stencils. Do not wait too long when pulling the stencil up or you may have trouble getting it up.
Lightly scrape in a diagonal direction against to the pattern lines and make sure to pull the scraper towards you. Pulling ensures you will not catch an edge on the fresh spray and chip a piece off.
Then blow or sweep off debris.