So you just received all your materials and ready to start coating everything in sight. Before you do something to mother in laws driveway that you may regret for the rest of your life, you might want to consider making a few sample boards first. In dealer training Chuck makes it very clear that it is important to make sample boards for several reasons.
First, you need to get all your equipment dialed in and adjusted properly, as well as getting used to how it all feels in your hands. By adjusting your equipment and playing around a little bit, you’ll become more comfortable and you’ll start to learn how to achieve the perfect results your looking for.
Second, you don’t want to waste a significant amount of product on a project without having some idea of what you are doing. Worse case scenario, you might end up having to grind it all off because it didn’t turn out the way you wanted or didn’t end up as a good example of your capabilities.
Before all your materials arrive, you should review all of your instructional DVD’s located in your welcome aboard package. Be sure to view the segment labeled “Doing the job right” There is also a video called “Assembling your equipment” located in the “Product application section” of the dealer website located at http://www.cti-concrete.com that should be viewed prior to getting started. Once you have organized all your materials, and reviewed the videos, then it’s time to get started making some basic sample boards.
We are often asked, “what’s the best material to use for sample boards?” You can use 1/4″or 3/8″ plywood, Luan, Masonite , Hardy-back board or Dura-rock. Any of these materials will work fine. Luan is light, durable, and inexpensive. On your first sample boards you may want to just use entire 4’ by 8’ ft. sheets of plywood. With this size you will be able to work on your skimming, spraying, and taping techniques. If you don’t like the way they turn out the first time, you can skim right back over them again and start over.
After you have practiced on the 4’ by 8’ sheets a few times and have gotten a little more comfortable with the product then you might want to consider making some smaller sample boards usually 2’x 2’. This size is light, easy to carry around, and can easily fit in a small car used for sales calls. Architects and designers also prefer the more convenient smaller sample boards.
Making sample boards requires the same procedures as doing a real job except for the prep of the surface. On a real job we would either acid-etch and power wash or mechanically abrade the surface in order to properly prep the concrete. Because sample boards are usually made of wood we recommend just skim coating them twice.
We suggest making at least 6 to 10 sample boards at one time. It doesn’t make sense to mix products and get your tools and equipment dirty for only 1 sample board. We usually start by mixing a ½ bucket of 105 grout at skim consistency. For half a bucket we mix ½ a bag of 105 grout and 2 ½ to 3 qts. of 110 or 112 modifier. We mix the grout with our ½” drill and square mixing paddle. Once the grout has been mixed, we then pour it out equally in to 5 or 6 smaller buckets. We then add approximately ¼ cup of 190 colorant to each of the smaller buckets making each bucket a different color so you can skim different boards in different colors. Next we skim coat each of our sample boards. After the first skim coat has cured, we lightly flat scrape or rub brick the surface, brush or blow it off and skim again. Allow the skimmed sample boards to cure out completely. Cure time will depend on temperature, humidity, air movement, and direct sunlight. Cure time could be as little as 1 hour at 85 degrees outside in direct sun light or over night if inside with cooler conditions.
Once the skim coat has fully cured, again flat scrape or rub brick as needed to remove any sling from the troweling and then brush and blow off. Any excess dust. At this point you can tape out the desired patterns using filament tape. You can do bricks, stones, tiles, etc.
After you have applied the filament tape for the patterns you will have to decide what type of texture you are going to apply over the tape, either a spray texture or a hand troweled stone texture. For either the spray or stone troweled texture, we will need to mix up another ½ bucket of 105 grout. This time however, we will make the mix a little bit thicker. We’ll mix ½ a bag of 105 grout with 2 ½ qts. of either 110 or 112 modifier. Be sure to mix thoroughly so that there are no lumps that might clog your hopper gun. Use a margin trowel to scrape the inside of the bucket when you mix to insure consistency. Once the grout is mixed, pour it equally into 5 or 6 separate buckets and then add ¼ cup of 190 colorant to each bucket making them all different colors. Now you have the ability to spray multiple combinations of colors on multiple boards. We suggest shooting the boards with lighter main spray colors first. Remember, when you spray your highlights to start with the lightest color and then work your way to the darkest. You will have to either clean your gun or switch guns to go back to your original main spray color. Refer to the “Doing the job right video” if this is unclear. Once you have sprayed and highlighted your boards, allow them to cure out thoroughly. Once cured, you can flat scrape, broom, and blow them off. At this point they should be ready to seal. For most Hallmark samples 2 coats of 150 or 155 sealer can be applied. You can use other CTI sealers such as Rapid Armor, Aquathane 6000, or Pro-seal 200 as well.