Prisma composite hull stiffeners are manufactured using a patented process, and constructed from high quality fiberglass knit fabrics and 2 PFC flotation grade polyurethane foam. Prisma hull stiffeners are frequently used for localized hull and deck stiffening.
Common installations usually only require a simple, three-step process. Wet out the underside of each Prisma beam, position them where desired, wet out the top side of each beam, roll the tabs, and you're done. Prisma preforms saves time, material, and labor costs on just about every installation.
Sold in 4 ft lengths.
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Sold in 4ft Lengths
Tabs & Base
Suggested Applications: Localized hull and deck stiffening
Use only with marine epoxy, polyester or vinylester. Proper surface preparation prior to installation is critical to achieving structural integrity. Follow the resin manufacturer's directions
Failure to keep PRISMA products dry and clean prior to installation can decrease the structural integrity of this product.
Prisma Composite Preforms
What is the length on these and the lengths they are sold in?
The ones I got were sold in 48" lengths, I dont think they have anything longer
Can the ends be beveled at 45 deg?
Yes, we beveled the ends at 45 with a razor knife and glassed them over. You have to do this yourself though.
Yes, I did that. I cut the foam on a 45 deg angle, then I covered the end with a small piece of glass cloth cut on the bias so that I could shape it over the end, and epoxied that in place.
I did so by cutting the foam out from the ends and folding down the glass.
Yes they can be beveled cut. You would need a very sharp knife
yes, the stiffeners are easily cut and shaped to desired form. used them in an olson 30 sailboat rebuild/stiffening project.would certainly recommend to anyone.
I plan to buy more of these.
I am using these to reinforce the hulls on my sailboat. They were easy to wet out with epoxy resin using a basic 2" wide brush. They are easy to handle and position inside the hull. The only thing you need to be aware of is that they naturally want to take a straight line. If you are installing them on a curved surface, you will need to come up with a way to get them to lay flat on that surface. In my case, I was able to position the hull so that I could place a series of weights on the stiffener to hold it in place as the epoxy cured.
It fixed my problem
I had a bulkhead that was causing stress cracks in the hull from flexing. I cut opening at bottom of bulkhead and installed the stiffener through the hole evenly on both sides and glassed over it. No more creaks , no more flex, no more movement.
Capt dave P
Plywood 13 boat
I used these as stringers in plywood boat to stiffen bottom. Very easy to use and install. I was told by manufacturer to remove grey felt bottom to save on epoxy use - they really suck up the epoxy.