I would recommend using butyl tape, and under no circumstances would I use 5200. That stuff will ruin your day the first time you need to remove it. The traveller should be through bolted, using good quality fastners. On my 35, the traveller was mounted to a non-cored section of the cabin top, so rebedding was easy and did not require any re-drilling, just using some butyl tape (purchased from Maine Sail on this site, just look for one of his posts and click on his name, the info will be there) and then tightening it down. The end caps on my traveller were only screwed in place and had worked loose so again it was easy to rebed and tighten down.