Originally Posted by JDCAVE
I'm going through this now. I refinished my caprail last spring and the finish has failed at the joints. S-3 Maritime does the commissioning for the new build kadey Krogens and they now caulk all the joints on the caprail. I have an email in to them but I want to report my recent failure. Yesterday, after considerable perpetration, I filled the joints with Sikaflex 291 and was very pleased with the way it looked...until 3 hours after it cured and I has Sikaflex soufflé! The Sikaflex had raised up considerably above the joint. I pulled the material out of one joint and it looks like closed cell neoprene. This looks to me like the product gases on curing.
I'm now looking into TDS Teak Deck Caulking but am unsure if I can source this product up here. BTW, as Sunchaser mentions, my joints are zigzagged.
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In my experience this will happen with Sikaflex if it is applied when temperatures are too high.
I used TDS on my deck, 60' of it. It failed all over, terribly. I sanded the joints with 80 grit, I put breaker tape into the joints, I even sacrificed a small mammal. It failed everywhere.
One side deck however did not fail, looking closely I noticed that it seemed to be slightly different. I talked to one of the guys who works for me who had done that section of deck, he confessed that he had misunderstood and had used one of the other sealants from the shop truck, Sikaflex 1a.
8 years and not a single failure and in that time I have slowly removed the TDS as it failed with a fien tool and replaced it with Sikaflex 1a.
When applying in the summer you need to shade the area, even in Seattle sun on a spring day can push deck temperatures above 130F in direct sunlight. I had this same bubbly experience in a couple of placed and had to dig it out. I put up a shade tarp and recualked the seam and it didn't happen again.
I am now preparing to open all my scarf joints, seal the end grain with penetrating epoxy sealant and fill the void with 1a as well becasue ever winter they open and crack the varnish....