Back in the 70s I had bad experiences with Sony PR-150 tape. Not so good performance, in the first place. And very prone to get sticky. I doubt whether you can find one PR-150 tape in Cuba that can be of any use. Instead, I use their reels for tapes I find on pancake form. On the other hand, at that same time I saw lots (I mean lots) of Sony SLH tapes so abused that the back coating was almost fully worn (you could see the brown recording layer thru the back of the tape) but the sound was there. Of course a tropical climate is not the best for tapes, but even when the PR-150 were new (and in a permanently climatized room) some gave trouble. And all I can find now are useless.