When it comes to bonding compounds, there are various uses and applications for them across various industries. At Delta Polymers, we are an in-house manufacturer of epoxy bonding compounds for industrial use. From sealers, to concrete repair epoxy, to much more, our bonding compounds are specifically designed for certain applications. Learn more about our bonding compounds and how to properly prepare a surface for use. And read on to learn more about the uses for bonding compounds and how to get the most out of them.
When proportioning and mixing bonding compounds of any kind, both the A & B components should be poured into a disposable container for proper mixing. Then calibrate the two containers in the volume mix ratio given on the data sheet. Scrape the containers clean to make sure everything is in proportion.
Once this is complete, then you can mix the contents with a paint stirrer. And if you have this tool at your disposal, hook up the stirrer to a low-speed electric or pneumatic drill for about three minutes. While mixing, move the stirrer up and down and around the sides until there is an even, streak-free color. If you do not have a drill, then use a steel knife that is cut off at the tip to give the flat end to reach into the can and mix by hand for about 5 minutes.
Always look at the directions, we come on the container of every Delta Polymers product. It is important not to mix more epoxy concrete bonding agent than you can use within the pot life of the product. And end to the pot life is indicated by heat buildup within the mixture, which is followed by solidification. If you spread the material flat in a shallow container, then you will extend the working life of using the bonding compound.
Again, read over the instructions on how to best apply any of the bonding compounds you purchased from Delta Polymers. You can use various tool to apply these bonding compounds, such as brooms, brushes, rollers, notched trowels, spray guns or squeegees. All of this depends on the type of surface you are applying to, the size of the area, and if there is going to be another layer of something added, like concrete sealer. Let's take a look at some of these scenarios and what we recommend.
Patches and Vertical Joints
Medium stiff nylon bristle paint brushes.
Overlays on Particularly Rough Surfaces
Spread compounds with rubber, a squeegee or a notched trowel. You can work into the surface with stiff bristle street brooms.
Overlays on Flat Smooth Areas
Short nap paint roller that is fitted with a long handle or squeegee.
Sandblasted Dry Steel
Medium stiff nylon bristle paint brushes.
The quickest way to apply bonding compounds and epoxies to large areas is by using a spray gun with selective brooming in rough and tough spots. The spray apparatus can be a two-component piece of equipment that meters, mixes and applies or it can be a conventional single component where large batches can be premixed.
When you use an airless type spray, it minimizes any over-spray and waste material. If you are doing this work in colder weather, then try to use equipment that offers internal heating.
When To Apply a Second Coat
Sometimes the bond coat loses its tack but hasn't become hard yet. When this happens, apply a second coat of epoxy before you place down any concrete. If the epoxy cures hard, then we recommend roughening up the first coat with a wire brush, abrasive wheel, or with some light sandblasting. And then apply a second coat of epoxy before placing down the concrete. Why this is important is due to the fact that fresh epoxy will not bond to a cured epoxy that is not rough. Any tack free or cured epoxy will not provide a structural bond to fresh concrete.
The concrete mix should be pretty dry. If there is featheredging involved, then the aggregate grading should be adjusted for it. A minimum 1" overlay offers the best results.
If you are vibrating epoxy bonding concrete, then you need to make sure that the head of the vibrator is away from the bond line so as to avoid wiping any epoxy away from the old surface.
When you are finishing concrete, your normal methods apply for epoxy bonded concrete.
Curing Concrete Overlays
If you are using thin overlays, those must be kept moist. Using burlap, polyethylene sheeting, or a good curing compound for 5-7 days is typically effective. Terrazzo and cement mortar are two common overlays that you apply thin.