Rubber roof adhesive recommendations

[CJM1973]

I'm in search of an adhesive that can re-adhere a small part of the TPO membrane (about 20 square inches) to my trailers roof decking. Looking for something that's available through amazon or locally at a big box retailer. I know Dicor sells a water based adhesive that only comes in a gallon. Looking for just a few ounces. I've read to avoid products with petroleum. Would a spray product like 3M 90 High strength spray adhesive work? Or can I use a general purpose contact cement? I've read that polyurethane-based adhesives are rubber roof friendly but not too sure.

Suggestions/recommendations are appreciated.

[The Evil Twin]

If it were me, I would just cough it up for the gallon of the right stuff. You dont want the membrane shrinking, wrinkling or coming loose because you used an incompatable adhesive.