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Plexus is not good for ppf. It has petroleum distillates that dry out the urethane and expand the pores, making it a dirt sponge. The product is also yellow in nature (look at the dried Plexus on the nozzle). It won't yellow film immediately, but repeated use will cause yellowing over time.
The picture below shows to pieces of raw urethane that were run through accelerated weather testing. The left one was left untreated, the right one was treated with Plexus.
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