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303 is certainly a fantastic product... it works great to safely protect and dress plastic, vinyl, rubber, and leather.
I use it most often on interior panels such as dash & console, door panels, all weather floor mats, door sills, etc. Another common use for me is in the engine bay. This stuff really makes the plastic engine covers look great.
In the summer I usually apply it twice a month, but I'm sure once a month would be fine. I also use it on the back seats especially the areas up top facing the back window. Does a great job keeping the leather nice. Also use it on the sunroof seal on top of the car.
I wonder how this stuff competes with Carpro Perl. I guess I have to get this to tell!
I have recently tested Perl and really like the versatility of it because depending on different dilution, you can control the shine and use it in various places. I tested Perl undiluted on the tires on one car and diluted 1:3 dilution on the other car, the look are quite good and last almost a week so far. I have not tried it on my interior yet. This product is like a new kid with new fighting style in the ring.
303 protectant has been proven by many, many people both newbies and pros that it works for so many years. The dash that had 303 look brand new like 1st day regardless how crazy the sun has attacked it. IME, it is by far the best in term of UV protection. This 303 is definitely the proven fighter champ in the ring.