Todd Bradshaw
Sailmaker
While Kevlar can add a layer of cloth with improved tear strength to the outside and a substantial increase in abrasion resistance, that same abrasion resistance can present a problem on whitewater boats. As Kevlar abrades, it gets fuzzy. Anybody who has ever tried to sand it knows this. You sand and sand and sand and don't get very far. It just gets fuzzier. If you're running a lot of shallow whitewater, the rocks will do this for you and the fuzzier your canoe's bottom gets, the slower your canoe gets because fuzz increases drag. About the only way to return the boat to a smooth bottom then becomes a task of flooding the fuzz with resin or gelcoat and trying to get it fair and smooth by sanding, but not sanding deep enough to start re-exposing the fuzz. It makes for a pretty difficult repair.
Whether they mention it in the catalogs or not, a lot of high-end Kevlar composite boats for tripping or whitewater actually have a layer of fiberglass as the outside composite layer over the Kevlar. It's main function is to wear away evenly when abraded and to be repairable, since it will sand cleanly. If you eliminate the fuzz problem, returning your scratched-up boat to one with a nice smooth bottom is a much easier job.
So adding a layer of Kevlar to the bottom of a stripper for whitewater could add both some good characteristics and also some less than desirable ones. Unless you plan to paint over the Kevlar portion, it might also be pretty ugly on a varnished clear finish. Kevlar is opaque and sort of a dirty gold color. It's also fairly difficult to cut and to apply while maintaining a crisp, clean boundary line. Even if you could live with the gold color, you might need to do something to cover up what will most likely be a rather ragged-looking transition line.
Whether they mention it in the catalogs or not, a lot of high-end Kevlar composite boats for tripping or whitewater actually have a layer of fiberglass as the outside composite layer over the Kevlar. It's main function is to wear away evenly when abraded and to be repairable, since it will sand cleanly. If you eliminate the fuzz problem, returning your scratched-up boat to one with a nice smooth bottom is a much easier job.
So adding a layer of Kevlar to the bottom of a stripper for whitewater could add both some good characteristics and also some less than desirable ones. Unless you plan to paint over the Kevlar portion, it might also be pretty ugly on a varnished clear finish. Kevlar is opaque and sort of a dirty gold color. It's also fairly difficult to cut and to apply while maintaining a crisp, clean boundary line. Even if you could live with the gold color, you might need to do something to cover up what will most likely be a rather ragged-looking transition line.