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GProduct tip G/flex Epoxy is a tough- ened, resilient two-part epoxy engineered with excellent adhesion to hardwoods and plastics. Visit westsystem.com for information on bond- ing to and repairing plas- tics with G/flex Epoxy. 3. Sanded Sand smooth non-porous surfaces—thoroughly abrade the surface. For most surfaces, 80-grit aluminum oxide paper will provide a good texture for the epoxy to “key” into. Be sure the surface to be bonded is solid. Remove any flaking, chalking, blistering, or old coat- ing before sanding. Remove all dust after sanding. Special preparation for various materials Cured epoxy—Amine blush can appear as a wax-like film on cured epoxy surfaces. It is a byproduct of the curing process and may be more noticeable in cool, moist conditions. Amine blush can clog sandpaper and inhibit subsequent bonding, but it can easily be re- moved. It’s a good idea to assume it has formed on any cured epoxy surface. To remove the blush, wash the surface with clean water (not solvent) and an abrasive pad, such as Scotch-briteTM 7447 General Purpose Hand Pads. Dry the surface with paper towels to remove the dissolved blush before it dries on the surface. Sand any remaining glossy ar- eas with 80-grit sandpaper. Wet-sanding will also remove the amine blush. If a release fab- ric is applied over the surface of fresh epoxy, all amine blush will be removed when the release fabric is peeled from the cured epoxy and no additional sanding is required. Epoxy surfaces that have not fully cured may be bonded to or coated with epoxy without washing or sanding. Before applying coatings other than epoxy (paints, bottom paints, var- nishes, gelcoats, etc.), allow epoxy surfaces to cure fully, then wash and sand. Hardwoods—Sand with 80-grit paper. (Sand white oak with 60-grit.) Teak/oily woods—Wipe with acetone 15 minutes before coating. The solvent dries the oil at the surface and allows epoxy to penetrate. Be sure the solvent has evaporated before coating. Porous woods—No special preparation needed. If surface is burnished, possibly by dull planer blades, sand with 80-grit paper to open pores. Steel, lead—Remove contamination, sand or grind to bright metal, coat with epoxy then sand fresh epoxy into surface. re-coat or bond after first coat gels. Aluminum—Sand and prepare with 860 Aluminum Etch Kit. Polyester (fiberglass)—Clean contamination with a silicone and wax remover such as DuPont Prep-SolTM 3919S. Sand with 80-grit paper to a dull finish. Plastic—Adhesion varies. If a plastic is impervious to solvents such as acetone, epoxy gen- erally will not bond to it. Soft, flexible plastics such as polyethylene, polypropylene, nylon, Plexiglas and polycarbonate fall into this category. Hard, rigid plastics such as PVC, ABS and styrene provide better adhesion with good sur- face preparation and adequate bonding area. After sanding, flame oxidizing (by quickly passing propane torch over the surface without melting the plastic) can improve bonding in some plastics. Its a good idea to conduct an adhesion test on a plastic that you are uncertain about. Using WEST SYSTEM® Epoxy 39 5.4.2 Bonding (gluing) This section refers to two types of structural bonding. Two-step bonding is the preferred method for most situations because it promotes maximum epoxy penetration into the bonding surface and prevents resin-starved joints. Single-step bonding can be used when joints have minimal loads and excess absorption into porous surfaces is not a problem. In both cases, epoxy bonds best when it is worked into the surface with a roller or brush NOTE: Joint strength—the ability to adequately transfer a load from one part to an- other—depends on the combined effects of three factors. GLUE STRENGTH—Careful metering and thorough mixing will assure the epoxy mixture cures to full strength. SUR- FACE PREPARATION—For the best adhesion and load transfer the surface must be prop- erly prepared. JOINT AREA—The bonding area, or adhesive area, of the joint must be adequate for the load on the joint. Increased overlap, scarf joints, fillets and reinforcing fi- bers across the joint can be used to increase bonding area. 5PDF Image | Vacuum Bagging Techniques 002150
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