The answer was YES. It seems that the Phenoseal re-emulsifies in standing water, like on the seat top, and it oozed down behind the face tiles. So I pried some of them off, and, to my surprise, there was NO tile cement at all on the backs of the tiles. Only wet, sticky, molten Phenoseal. Now I'm prying off those face tiles, trying to get my builder over to retile the front of the seat (the flat tiles on the top of the seat, where I actually PUT the Phenoseal, still look OK, but I have my doubts about them, now) and get my downstairs shower in working condition again.
Of course, I never found any disclaimer or warning about this on the package -- although I'm sure it must be there in 8 point type -- so now I'm stuck with both a mess AND a couple of hundred dollar repair job.
So friends, be careful about using caulking of any type on flat surfaces -- especially PHENOSEAL.
Pheonseal is sold by a number of marine chandlers for use as a boat sealer. I would NEVER allow it on my boat, knowing now what it does and how it performs in a wet environment. IT IS CRAP!!!
O.K., call me crazy, but I really think a sealant should... seal.
"Thank you for contacting DAP Inc. with your inquiry, based on the description of your application in your "blog" it would appear that the product that the product that you selected was not the best choice for your intended application. DAP Phenoseal Vinyl Adhesive Caulk Does It All is a water based adhesive/sealant formula which is not recommended for use in below waterline applications (FOR BEST RESULTS: Do not use below waterline.)...
Based on the description of your application, we would generally recommend the use of a 100% Silicone Rubber Sealant.
Thank you, Jason"
"NOT RECOMMENDED?" That's an understatement, if I ever saw one. Then WHY do they call it (and these are THEIR words) "DAP Phenoseal Vinyl Adhesive Caulk Does It All?" "For best results..." Jeez. What an understatement. In a submerged environment, it simply FAILS. BEST RESULTS???
In my mind, these bastards still owe me $200, to boot.
September 18, 2006. I finished cleaning the affected area and re-cemented 4 new tiles onto the front of the seat. On Tuesday, I'll clean out some of the grout on the seat and grout the whole area. I never did this before, so I have hopes but not expectations. By Thursday evening, the shower should be ready for use again. If there's any more Phenoseal damage, I'll report back.
August 18, 2007. I see a face half tile on the end is starting to stick out. This wasn't one that I replaced previously, I don't think. I'll let it come out some more before I try to remove it. What a fricken mess. I hope the whole world reads about this garbage product.
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