USE

A-788 can be mixed and applied underwater and will cure underwater as well as in air. It adheres to any clean sound surface, either wet or dry, including aluminum, galvanized steel, steel, concrete, wood, fiberglass and existing coatings. It cures to an extremely hard coating which is abrasion and impact resistant, and which will substantially retard further erosion or corrosion.

A-788 is also solvent and chemical resistant when cured. It has been used as a grout and to patch perforated steel in tanks and pipelines holding mineral spirits, xylol (xylene), gasoline, acids, alkalis, hot water solutions (up to 160 deg F). Tanks must be clean and dry of their contents in order to use A-788. It will not cure properly in acidic or alkaline water solutions outside a pH range of 6 to 9, or in contact with solvents. Water pressure at a leak will push through A-788 before it cures; drain tank or relieve line plate or sheet of fiberglass, slightly larger than the hole, for additional support. Bed the support material in A-788, then coat with A-788.

Not for use in potable water.

TECHNICAL DATA

SURFACE PREPARATION

Remove all dirt, oil, grease, loose paint, rust, rotted and spalling concrete, rotted wood, marine growth and other interference materials. Adhesion of A-788 will only be as good as the cleanliness and soundness of the substrate. Sandblasting is preferred. High-pressure water blasting is acceptable. Scraping and other manual means of surface preparation are time consuming and of limited benefit. Sandblasting underwater can be done as the initial air blast will clear a patch through the water for the sand-air mixture. When working at splash zone or in salt water, coat cleaned metal surfaces as soon as possible to minimize new corrosion.

MIXING INSTRUCTIONS

Mix by hand. (Some people may be sensitive to epoxy or polyamide resins “ (wear tight fitting rubber gloves). Keep hands and material wet with water during mixing. Scoop a quantity of one component from can by hand. Scoop out an approximately equal quantity of the other component.

Mix and knead material by hand until the yellow and black components have combined to make uniform olive-green color. Apply immediately after mixing; no sweat-in time is required before using.

APPLICATION INFORMATION

Apply by hand. (Wear rubber gloves if sensitive to epoxy or polymide resins). If applying to dry surfaces in air, periodically rewet hands with water to facilitate application.

Spread smoothly on surface in 1/8 inch to 1/4 inch layer using heavy hand pressure to displace water and air bubbles. Smooth off by hand. When starting another handful, start spreading at and away from the previously applied film so as not to trap air bubbles or leave an area of uncoated surface. When used as a patch or grout, force material into hole or crack and smooth by hand to the thickness needed.

For marine applications in the splash zone, use all necessary safety precautions to protect the applicators. Wear wet suits if necessary to help preserve body heat; use life jackets and safety lines. Avoid working in excessively rough seas.

When applied underwater or when wetted with water during application, the surface of A-788 will form an emulsified lighter green scum layer. This is normal. The emulsified layer facilitates application. The film under the layer remains undisturbed and will cure properly. The layer will cure and most will become part of the finish if cured above water. The layer will remain soft and uncured if the A-788 is kept underwater during cure.

PRECAUTIONS : Follow precautions listed on a A-788 label.