I tested the Hobie Protectant against 303 a couple of years ago and haven't used the 303 since. Anyone is welcome to have my bottle if they want to stop by and pick it up (or meet me down at Hodges). 303 is a fine product though and I'd use it if I didn't have any of the Hobie Protectant.
They're both very slick, so I don't use it on the top surfaces where the slipperiness might be a problem.
An application tip -- I spray it on lightly and spread it around with a damp cloth. It goes on evenly, does the job without excess waste and makes the product last longer.
I tested Hobie Protectant against 303. IMO, they're both good products but the Hobie seems to be a little slicker. As you view the following series, 303 is on the left side of the boat and Hobie Protectant is on the right. In the first sequence both disks start out even...
...then the bow is lifted until there is some disk movement.
As you can see, the right side appears slicker.
In order to eliminate possible differences in disk surfaces, I switched sides and repeated the exercise:
I ran the series twice and varied the starting points -- the results were consistent. After a few uses, the Hobie Protectant seemed to remain a little longer also. So I use the Hobie Protectant.
I'm not sure if or how much faster this makes the boat go, but it provides a nice shine at least.
PS: Be careful where you put it -- both products make the surface very slick for gripping or traction purposes!
NOHUHU, that WD-40 should help keep your amas from rusting anyway. I hear it's also good for the joints. Anyone try it on cereal yet?