Best protectant…

I'm learning here. I've never put anything on any of my inflatables. I'm a bad owner.
 
I used the spray version yesterday on a new pontoon boat. Very easy to use; spray on and wipe off with a microfiber cloth.
 
A different perspective (full disclosure, I follow chemicals around the environment for my job):

Are you absolutely sure you need a "protectant" product for your watercraft? Are you sure it really helps in some way that significantly changes the lifespan of your watercraft? It might, I don't know. I do know some of these chemicals will end up in the water, in the fish, and then in us if we eat the fish later.

One minute of internet searching on a 303 product turns up 6 chemicals on "concern" lists in this product, including one carcinogen list and one "marine priority action chemical":

There's a good chance it has no real effect on the environment or us, but we probably know less about those harm/toxicity things than you might expect.

Why are lots of things that are super effective so toxic? It's such a bummer.
 
Why are lots of things that are super effective so toxic? It's such a bummer.
Toxic or destructive. The latter with petroleum based products in particular. At my work we have a bewildering array of bearings, pneumatic cylinders and the like, that need very specific lubrication products. Using the wrong one in the wrong application can cause major issues. One boo-boo I've seen over the years is putting a petroleum based grease (great product in the right place) on pneumatic cylinders. Over time, the volatile compounds in the grease break down the o-rings that seal the cylinder. Leaky air cylinders in a clean room are no bueno. Those volatiles make themselves known to your nose when you pull the cap on the grease tube. So a good rule of thumb is if something stinks, it might not be safe for some materials.
 
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