Prisma 24 oz Biaxial Cloth +-45 with T-mat Backing
Prisma Glass Biaxial cloth consists of 2 layers of parallel unidirectional fibers, each layer at a different orientation (+45°). Layers are held together by light stitching and backed with a polyester based T-mat (aka Trevira) backing that adheres tenaciously to bonding surface. 24 oz. per square yard material.
The same reinforcements that make Prisma preforms super tough are now available in this fabric form. Prisma Glass features exclusive T-Mat backing, where High Tenacity Thermoplastic fibers improve toughness and bonding. Perfect for boat repairs and new construction. The cloth and special backing work with Epoxy, Vinylester and Polyester resins. Build boats like the pros using the same Prisma materials the OEMs use.
Excellent strength characteristics for composite repairs to hull, transom, stringer, bulkhead and floor applications.
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Available in various width tabs, 20 or 10 per pack. Also sold per yard from roll.
Prisma Composite Preforms
What is recommended biaxial cloth for sailboat bulkhead repair - i.e., tabbing 3/4" marine plywood to fiberglass hull?
I think that would work fine.
JOHN "C HILL, JR. "
The 24 oz bi axial cloth is very heavy and rugged. It should do a good job for bulkhead repair. I will point out that when finished it is .075 inches thick so plan on tapering out the joint with thickened epoxy for a smooth transition if it is in public view. The material takes a lot of epoxy to fill. Plan on two to three coats of epoxy. I pre-coat the surfaces and if working with a strip of fiberglass will pre wet it before setting it in place. A bubble buster or a firm chip brush helps remove the bubbles. Also it takes a couple of minutes for the epoxy to soak into the fiberglass which always surprises to me. I recently did the exterior of a wooden boat with this material and also layed the wooden keel onto the fiberglass hull with a sandwich of the 24 oz material in between.An alternative to the 24 oz bi axial is to put two layers of 10 oz. This is much easier to work with but best as a two step process. Lay one coat on and allow to cure, sand and lay on the second coat.Best regards
A great product.
I used it to reconstruct a curved teak box top. Teak deck strips were then glassed on top of the Biaxial w/T-mat backing cloth. This cloth is much easier to work with than equal weight woven roving or chopped strand in that it holds its shape well and strands don't shed out. It does require additional care to saturate and air bubbles needed more rolling to expel. I also used the cloth to do some deck repair and vacuum bagged it eliminating all bubbles and reduced the amount of epoxy needed to saturate it.