Hi, Ken.
Thanks for coming back to me.
I think you may be on to something. The Mastic looks ok and came off ok. I think, as you suggest, the meths has reacted with the black adhesive part of the Classi seal tape and I'm left with this mess!
Regards
Paul
Hello folks, new member with a somewhat peculiar issue.
On Saturday past I decided to reseal / re bead two sides of our bath as some of the previous beading had become a little tired looking. I should stress that there were no signs of mould whatsoever.
I stripped out the old silicone, masked...