JRP
Platinum Member
I used square tubing for a project and didn't want to have wasps build nests inside the tube, so I used a urethane foam to fill the ends. It seems like it will work well and was much faster and easier than welding on ends. After the stuff cured i trimmed it flush with the end using a sharp putty knife.
The second coat of paint will make it orange.
The second coat of paint will make it orange.