How do you fix a plastic kayak?

To fix a plastic kayak, first clean the damaged area thoroughly to ensure good adhesion. Use a plastic welder or a heat gun to melt the edges of the crack or hole and press them together, or you can apply a specialized kayak repair kit that often includes patches and adhesive. For larger holes, a patch made from a similar plastic can be melted onto the area for a stronger bond. After the repair has cooled and set, sand it down for a smooth finish and apply a sealant if necessary.