My seams appeared this way initially when I first added water but upon inspection it seemed to have dissipated. Just a couple of spots here and there.
Oh, Ummm, sorry, what I meant to say is that there is definitely something wrong with your sealant and I recommend getting rid of it as soon as possible, in fact I collect ummm, defective tanks, and so I'd be glad to take it off your hands before something disasterous happens!! I'll go ahead and PM you with my address, don't worry about shipping, I'll take care of that for you....

Oh, Ummm, sorry, what I meant to say is that there is definitely something wrong with your sealant and I recommend getting rid of it as soon as possible, in fact I collect ummm, defective tanks, and so I'd be glad to take it off your hands before something disasterous happens!! I'll go ahead and PM you with my address, don't worry about shipping, I'll take care of that for you....