Hot, hot, hot!
UV causes fading, bubbling sounds to me like the previous owner parked it in the sun a lot and allowed the interior to become an oven.
I have used various leather products over the years, I would say my two favorites would be the one-step Meguiar's Gold Class stuff, or the two-step Zymol cleaner/conditioner and straight conditioner. I am not a fan of the Lexol products.
The best way to prevent bubbling from happening again is to avoid the high interior temps in the summer, though. Garaging the car is perfect, of course, but at work I park in the shadow of a building when possible, and I use a cockpit cover--one that fits with the top UP, not just down. (You will find plenty of "cockpit covers" that fit with the top down only, but wind will blow lots of dust and grit into your car.) I leave the windows cracked an inch or so underneath the cover. The cover also prevents bird poop from getting on the fabric top.
Searching the web, you can find a couple that work with the top up. I first tried the one made out of Tyvek, but that still allowed the interior to get hot enough to kill my climate control display. I wanted something that blocked even more heat, so last summer I switched to the Reflectionite product, which is metalized on top and has car cover material on the underside. Much better heat blocking, and my only complaint is with the bulk of it folded up and stored in the trunk. No affiliation, etc.
RoadsterSolutions makes a cover which has padded extensions to combat door dings, if you are worried about that, too.
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