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Here are some photo examples of seat padding made from closed cell foam. One source of such foam can be found here at North Shore. One way to install is to first locate where you want to put the pad. After putting layers of pipe wrap tape in the bucket to protect your boat finish from the velcro adhesive you can install your seat. After being cut to shape all of these pads have been covered on the top side with teflon tape to facilitate your rotation. Some installers:
Extra foam has been added to this pad in the back section but not underneath
This is 1/2“ foam with wide pipe wrap tape cover and wide teflon tape on top of the pipe wrap
After installation and use, the pad adopts the curve of the bucket
Back side of a pad with velcro tape attached
Velcro tape in bucket installed on top of pipe wrap tape. The velcro tape can meld with gelcoat so you want at least two layers of pipe wrap tape first to allow reasonable ease and no damage if you want to remove the velcro tape.