The model that you have(C285LR) is a PVC boat. Since it is a high pressure air floor, correct PSI is 11.2, you will need to install a patch over it. It is going to be difficult to get a good seal being on the edge of the raised piece in your photo
. The correct solvent to use is MEK for any PVC inflatable
repair. A good quality two part PVC adhesive
is your best bet to get a good bond. Something like polymarine or weaver brand adhesive
would be best. If you need further assistance, feel free to send me a PM and I will be glad to help.