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Vacuum bagging Bonding teak veneer to plastic cabin sides by Scott Senkbeil LoverS of CLASSiC SAiLboAtS wouLd AGree thAt A teAK coach house is a beautiful sight. However, as time has progressed and cookie-cutter fiberglass boats have become the norm, teak (and the upkeep it requires) has dis- appeared like a ship going over the horizon. There are still a few with fiberglass classic boats who love a teak-sided coach house. They don’t mind the upkeep associated with it, believing that the beauty of teak far out- weighs the winter upkeep required to keep it looking new. One of these sailors is Richard Charette, a friend of mine. I have been working with Richard on the restoration of his 1984 Sea Sprite 30, Panache. Obviously, rebuilding the coach house, or siding it with teak planking, is not an economical way to create the classic look. Teak veneer, with its workability, became an economical alternative, but what would be the best way to bond veneer panels to the sides of the coach house? The answer: vacuum bagging. This process is, in our opinion, the easiest method of clamping irregular or large laminates and veneers. The ability to clamp irregular shapes makes vacuum bagging the logical choice for bonding veneers. It also works well if you’re considering adding teak strips to your cockpit seating area. This whole process is best visualized as a ‘seal-a-meal’ machine for clamping. What is vacuum bagging? The process of vacuum bagging uses a polyethylene/poly- urethane sheet to apply pressure to the materials beneath it. This is made possible by sealing the poly to the surface to be bonded to with an airtight material called tacky-tape, a mastic-type sealant, which is very pliable, easily shaped and cut, and can be removed cleanly. The perimeter of the area to be bonded is outlined with tacky-tape, and then the poly is sealed to the tape, while tak- ing care to press the poly as smoothly as possible, thereby creating an air-tight seal. The heart of the system is the vacuum pump or generator. The pump supplies vacuum to the poly by means of a manifold, a two-sided disk with a seal in between that, when connected on both sides of the poly, creates a port for the vacuum line from the pump to be con- nected. Then it evacuates the air inside the poly and creates an even surface of clamping pressure. This whole process A sheet of strong poly is sealed to the area and a vacuum pump is used to supply an even clamping pressure. is best visualized as a “seal-a-meal machine” for clamping. When you remove the air from the inside of the bag, the atmo- spheric pressure squeezes the outside. For our teak veneer project, we first removed the teak trim on the top outside edge of the coach house, then filled and faired all screw holes with thickened epoxy. As the trim was replaced, and we were installing the mounting screws in different locations, the need to have the mounting surface air- tight (watertight) necessitated filling the old holes. The next step was to lay out the shape of the veneer. For this, we applied common contact paper (wood-grained shelv- ing paper) to the cabin sides, lining up the top with the old screw holes and trimming the bottom edge by marking the contact paper with a magic marker, using a template made www.goodoldboat.com 33PDF Image | Vacuum bagging
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