What products are you using specifically? Before Alpha came out with their lines of products folks used Dicor and it even said safe for TPO roofs on the products - what does yours say? Now, depending on what product you're looking at some of them say "safe on some TPO roofs" or don't mention it at all. Dicor now has some of it's products (lap sealants) formulated for TPO roofs. Don't remember what the name is exactly but maybe it's Dicor Plus?
If you've used it twice and the membrane isn't bubbling or getting sort of loose looking you are probably OK. I've used it on mine because I had a couple of gallons of not only the cleaner but the sealant and wanted to try it. It didn't hurt anything - I gave the rest of it away. I'm going to just clean the roof material next go round and leave it at that then watch it closely to see if the protectant provided any benefit.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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