Walton Kayak Material type

I have an older Walton Kayak I want to do a Keel repair on. Does anyone know what type of plastic they are made of? I will be repairing it myself. This is a beater kayak that has served us well.

Walden Kayaks big claim to fame was building their hulls from recycled plastic source material. Have any pix of the area you want to repair so we can make suggestions?

I will post a picture shortly. Phone charging port burned up😣