I had an instructor go so far as to say that, if you're properly hydrated, then you absolutely should be wetting your wetsuit, probably right after you start the dive... in fact, it's so important, that if you're wondering whether or not you are hydrated enough to go into the water, the aphorism to remember is:
Dehydration anytime is not good; but dehydration while diving can significantly increase your risk for DCS. One concern with trying not to pee your wetsuit is that you will be consciously or subconsciously dehydrating yourself in order to achieve your "goal", putting you at higher risk for something as serious as DCS just in order to avoid a little warm water inside your suit.
So, do the exact opposite. Take hydration seriously. Start drinking water well before the dive. Drink more water and have a salty snack during your surface interval. Your goal is "clear and copious" urine output, so indeed you should "be ready to go before you're ready to go" diving.
If you do this, although you are indeed wetting your suit, I think you'll find it's pretty dilute and doesn't tend to stink up the suit as much. Besides, the pre-packaged wetsuit cleaners do a pretty good job of cleaning out whatever smell remains - personally I find the McNett Mirazyme enzymatic cleaner to be particularly effective at that, but there are lots of homebrew methods too.
Just my .02
If you're not ready to "go", then you're not ready to go.
Look, if you're an open-circuit diver, you already have the deck stacked against you in terms of staying hydrated. Not only are you subject to the immersion diuresis mentioned before, but that ultra-dry compressed gas you're sucking down is dehydrating you with every breath.Dehydration anytime is not good; but dehydration while diving can significantly increase your risk for DCS. One concern with trying not to pee your wetsuit is that you will be consciously or subconsciously dehydrating yourself in order to achieve your "goal", putting you at higher risk for something as serious as DCS just in order to avoid a little warm water inside your suit.
So, do the exact opposite. Take hydration seriously. Start drinking water well before the dive. Drink more water and have a salty snack during your surface interval. Your goal is "clear and copious" urine output, so indeed you should "be ready to go before you're ready to go" diving.
If you do this, although you are indeed wetting your suit, I think you'll find it's pretty dilute and doesn't tend to stink up the suit as much. Besides, the pre-packaged wetsuit cleaners do a pretty good job of cleaning out whatever smell remains - personally I find the McNett Mirazyme enzymatic cleaner to be particularly effective at that, but there are lots of homebrew methods too.
Just my .02