The author is exploring the use of a brushable silicone vacuum bag for infusing their next canoe, which is reusable and does not require mold tape at the perimeter. They have been interested in vacuum bagging for a while and have found a video on the process from West System. Vacuum bagging is an easy, multi-purpose technique that is within reach of most amateur boatbuilders. Vacuum Assisted Resin Transfer Molding (VARTM) is a method for creating composite parts using vacuum pressure to distribute resin through the reinforcing fabric.
Configuring a vacuum pump should include an air tight piercing of the bag, a trap to prevent resin from being drawn into the pump, and a vacuum gauge. Vacuum bagged construction is better than older fiberglass boat construction methods. Even a small pump can work on a large part if the bulk of air is first extracted with a Shop-Vac®.
Vacuum bagging will give a lighter layup but may not be worth the effort for the first time. A website that deals with vacuum infusion offers a similar method without the rush. Rotary vane pumps are okay, but when treated properly, they last a long time. Dry ice is recommended around the vacuum pump to prevent water vapor from entering it.
For beginners, it is recommended to do a couple smaller pieces before trying to infuse a whole canoe. You can control the amount of suction by bleeding off some pressure at the pump and closing the valve. If you have a Semple single in your Elliott Bay hull, you may only get about 9 vacuum.
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