... was told that they have been having problems with the TKC's sealing onto the bead..
Thanks for reminder as I'm about to try this. I presume you were using a TL TKC front, not an old TT or Tube Type (easily missed when ordering as I just found out)? Not that I'm sure what the difference in bead surfaces might be but I imagine the carcass of a TL tyre is better made to deal with plugs: here a rear TL TKC is 30% more expensive than a TT in the same size which one hopes is reassuring.
i could never find a leak (soapy water) and all blow-outs were quite instant. Truth is, i'm really not sure what failed, the sealant or the tire.
Would the marginally bigger diametre of a 21" make more centrifugal force to help delaminate it if it was not cured/stuck on well? Though would not tyre pressure hold it in place [did i mention this earlier?]? Even if it delaminated all at once would enough air leak out via the nipples to cause and instant blow out as you say?
If i was to seal a rim, i would use Sikoflex marine sealant. First buff the aluminum with a stainless wire wheel to give the sealant some tooth, apply sealant and let it cure. Sikoflex will stick to aluminum permanantly, so this is a one way trip!
Found 'Sikaflex Sealant 291'. Looks like '3M 5200' but 30% cheaper.
Remember that the space where the spokes go is required for removing the tire, so your sealant could easily become damaged if your not careful.
I would put the rim tape back over the sealant and/or wrap on some duct tape.
Ch
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