You can make carbon fiber armor, but it would be difficult.
Making good armor isn't just about being able to shape the material in question, but about being able to shape it into armor.
First, you need to know what shape to make the armor. Armor smithing is a skill that was developed over millenia, not something a group of teenagers could easily discover is a post-apocalyptic boat shop. What armor pieces are needed, how they all link together, where to put straps, etc.
Of course, one of your heroes might have that knowledge, but even then, actually putting it to use would be tough. Each suit of armor would need to be fitted to the person that was wearing it. Furthermore, each piece of each suit of armor is going to need its own mold, which will have to be precisely shaped before the carbon fiber is laid over the top of it. Assuming they have all of the materials, and that the boat shop still has power during a zombie apocalypse, and that the group has the knowledge of exactly how to go about making armor and what all the pieces need to look like, this is going to take a while, probably at least weeks, if not months.
Other forms of armor would be better.
Zombies aren't attacking with swords or clubs. Zombies aren;t even attacking with kicks or punches. They have one weapon, biting, and they aren't event particularly good at it.
Humans, and by extension zombies, have short faces and weak jaw muscles. We have not evolved to use our teeth as a weapon, and as such our teeth make for terrible weapons. They lack both strength and penetrative power. Rather than going for something like carbon fiber, it would make more sense to build armor out of something like leather or ballistic nylon.
These materials could easily withstand a bite, and would be difficult for a zombie to rip with their hands. They're both fairly easy to mend, especially compared to carbon fiber, and would be easier to work with and move in. The materials also don't require power tools to work with, which is a plus over carbon fiber, in which such tools will be all but necessary for making molds.
My preference would be for a double layer of ballistic nylon coated with urethane everywhere but the insides of the joints. This would be all but impervious to zombies, and would be fairly easy to make. Luckily for your heroes, all of the materials for making such armor could be found in a boat shop, with ballistic nylon and other similar materials currently serving as the go-to material for sail making in the racing world.