Epoxy blush can happen from time to time and you'll know it when you see it. Basically, your epoxy finish will look milky white or in cases of the darker colors have a grayish color to the surface. This can happen because of one of two reasons. Either the epoxy hardener was not mixed with the resin properly or the curing process took place during a time in which the dew point closely matched the outside temperature. This weather anomaly usually happens during colder temperatures as nightfall approaches. You should make sure that your new coating has at least a six hour window of consistent temperature to cure in. When mixing, you need to make sure you scrape the sides of the mix container you are using and mix the epoxy thoroughly. To protect against condensation, you should apply your coating during a time such that condensation will not accumulate on the surface of the coating until it has completely cured.
If you have a case of epoxy blush, don't fret! It's pretty simple to fix. In most cases simply rubbing the area with a rag with lacquer thinner on it will clear the blemish right up. In worst case scenarios you may have to scuff the area with a green scotch-brite pad to remove the fogginess and then apply new, thin coat over the affected area.
You'll find that Pond Shield resin has the consistency of grease and slightly thinner after the hardener has been mixed in with it. It has been designed thick so that your coating application thickness will remain consistent. That is to say when you are working on a vertical or upside-down area of your pond, Pond Shield, when applied at 10 mils, will remain at 10 mils until it has cured. This provides you with the assurance that your coating will be at the correct thickness throughout the application in order to function properly.
This thickness also allows Pond Shield to bridge hairline cracks without a problem. However, cracks larger than hairline can form and it may be easier to fill those with an even thicker version of Pond Shield.
West Systems manufactures a variety of filler materials for this very purpose. The 400 series created by West Systems comes in varying styles from colloidal silica (like that shown in the pictures) to micro fibers (slightly larger than colloidal silica). West Systems filler additives can be purchased at almost any marine retail shop. Prepare your complete surface area in accordance with the instructions from your Pond Shield kit and then prepare the crack properly, by cleaning it and removing any loose debris. Decide how much resin you will need to fill the crack in your concrete. Mix JUST the resin with small amounts of the colloidal silica until the desired consistency is achieved. Be sure to mix thoroughly. Then mix your hardener with the resin and apply with a putty knife. Using this method, you can make Pond Shield as thick as you need for the job at hand.
As we all know, ponds come in all shapes and sizes. They are also made of a variety of different building materials. Some of these materials may need a little extra strength when being used. Take wood for instance. A pond built from wood will have to be structured so that it does not move or flex beyond the capabilities of both the fasteners holding it together and the coating sealing the interior. The best way to overcome that is to use fiberglass tape on the seams of your project.
Essentially, all you'll have to do is apply Pond Shield to the seam area and then lay a piece of one inch or two inch fiberglass tape down. Push the tape into the Pond Shield and then apply a new coat right on top of the tape while the coating is still wet. Be sure that Pond Shield saturates the tape and continue coating the rest of the surface area. After you have finished, the fiberglass tape should have come close to disappearing into the epoxy coating and provided you with a much stronger joint. Also, if you are using plywood, we would recommend that you use a grade that utilizes exterior waterproof glue for the laminate. Use this strengthening method on wood joint, cold joints in concrete or any other area that you think a joint will flex or move more than normal.
More Tips and Tricks can be found on Page 1 and Page 2