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5.4 5.3.5 Removing epoxy Removing uncured or non-curing epoxy. Removed uncured epoxy as you would spilled resin. Scrape as much material as you can from the surface using a stiff metal or plastic scraper—warm the epoxy to lower its viscosity. Clean the residue with lacquer thinner, ac- etone, or alcohol. Follow safety warnings on solvents and provide adequate ventilation. Af- ter re-coating wood surfaces with epoxy, it's a good idea to brush the wet epoxy (in the direction of the grain) with a wire brush to improve adhesion. Allow solvents to dry before re-coating. Removing fiberglass cloth applied with epoxy. Use a heat gun to heat and soften the epoxy. Start in a small area near a corner or an edge. Apply heat until you can slip a putty knife or chisel under the cloth (about 200°F). Grab the edge with a pair of pliers and pull up on the cloth while heating just ahead of the separation. On large areas, use a utility knife to score the glass and remove in narrower strips. Resulting surface texture may be coated or remain- ing epoxy may be removed as follows. Removing cured epoxy coating. Use a heat gun to soften the epoxy (200°F). Heat a small area and use a paint or cabinet scraper to remove the bulk of the coating. Sand the surface to remove the remaining material. Provide ventilation when heating epoxy. Basic techniques The following basic techniques are common to most repair or building projects, regardless of the type of structure or material you are working with. 5.4.1 Surface preparation Whether you are bonding, fairing or applying fabrics, the success of the application de- pends not only on the strength of the epoxy, but also on how well the epoxy adheres to the surface to which it is being applied. Unless you are bonding to partially cured epoxy, the strength of the bond relies on the epoxy’s ability to mechanically “key” into the surface. That is why the following three steps of surface preparation are a critical part of any secondary bonding operation. For good adhesion, bonding surfaces should be: 1. Clean Bonding surfaces must be free of any contaminants such as grease, oil, wax or mold release. Clean contaminated surfaces with lacquer thinner, acetone or other appropriate solvent. Wipe the surface with paper towels before the solvent dries. Clean surfaces before sanding to avoid sanding the contaminant into the surface. Follow all safety precautions when working with solvents. 2. Dry All bonding surfaces must be as dry as possible for good adhesion. If necessary, accelerate drying by warming the bonding surface with hot air guns, hair dryers or heat lamps. Use fans to move the air in confined or enclosed spaces. Watch for condensation when working outdoors or whenever the temperature of the work environment changes. Using WEST SYSTEM® Epoxy 38 CLEAN DRY SANDED 5PDF Image | Vacuum Bagging Techniques 002150
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