Padeen wrote:
Your experience with 303 matches my own, and with your input I now believe
that what Brian says below about Armor-all:

"Take your bottle of Armorall to the nearest trash can and deposit it there.
It's worthless junk that damages more materials than it preserves, including
your car."

can be said for 303 as well. I've found that the only use 303 has is to
force the use of more 303; very handy if you sell 303 but just another
consumer-targeted fraud. I've had my present drytop since 2000, have used
nothing on it, never washed it, store it in -50 deg. and expect to replace
the worn-out fabric (G-tx) before the gaskets.

Brian's other comments seem reasonable.

FWIW, I use 303 primarily on hatch covers and it seems to work OK. I do
use it occasionally on my dry suit neck seal (the only one exposed to UV
and haven't found any negative effects. I can't say for certain that
it's helped much, but it doesn't seem to have hurt.