Polyester vs Epoxy Resin on Hydrasport Restore

[BASSCAT7]

They did but it was more for Marketing of the boats than it was a structure strenght idea. My understanding is they put kevlar in 4 different spots on the boat and as long as they had a certain amount of Kevlar, Kevlar would allow them to Stamp the boat. It worked, they sold a lot of boats because of that stamp. Great boats with or without the stamp in my opinion! Thanks for the input though!

This is correct, the Kevlar was only in a couple of areas, none really structural, and used for advertising purposes, just like the new " Carbon Fiber" Ranger where the Carbon Fiber is only in the underside of the deck lids and a couple of other non structure areas and none in the hull. Pure marketing purposes to attract money from customers who only read the advertising brochures.
Carbon fiber is around $ 10.00 - $ 20.00 a pound, roughly 5 - 10 x the cost of glass mat. To build a carbon fiber hull would run around 15 - 25 K up and above a normal glass hull.

[BarkleyBoy]

Kevlar's compression strength is substantially lower than its tensile strength. Its related to its chemical structure. Also, Kevlar absorbs moisture which also reduces its mechanical properties. These are some of the reasons why few new structural applications utilize Kevlar. If you really want to add stiffness and strength then incorporate carbon fibers. If the original use of Kevlar is localized and limited just increase the thickness of the glass fabric.