Hello,
I guess everyone seems to be not mentioning the obvious things, like:
-Squeegeeing your barrel before the start whistle of every game.
Just think about it, your barrel will get water in it no matter what you do, so why don't you clean it out just before you really need to shoot straight.
-Squeegee often during the course of the game. For the same
reason as in point one. Even if you wrap your barrel in Saran-Wrap, every time you lift your gun, water will get into it, especially if you have an exposed bolt.
-Wrap your barrel. Yes, you can use the cylindrical plastic case
your barrel probably came in (put an end cap on and cut an "X" in it and shove your barrel through it) so that the porting will vent properly, but why? Under rainy conditions, your balls will fly like crap anyway (I've watched them change direction apparently due to hitting raindrops) and the most important thing is to keep your balls as dry as possible, that way you avoid chopping (wet balls stick, and swell...get your mind out of the gutter) and your velocity won't vary as much (Angels seem to run hotter if their barrels are wet, that's why you should always squeegee before chrono-ing), so wrap your barrel in Saran-Wrap, or Cling-Wrap that you stole from your kitchen...or spend a dollar and go buy a whole roll/box of it.
-I always fog when it rains, and I find that I become a mouth breather...I try to direct my outgoing breath downward with my mouth, and yes, I do have thermal lenses and a fan. I also wear glasses...I can't wear contact lenses when I play. As someone pointed out, don't overdress. You WILL overheat when you play. Plastic trash bags seem to be the best raingear. You can throw them away just before the whistle starts, and you can hide your gun under it, next to your body, to protect it from the rain. I use a talking timer and I usually take a corner from a plastic bag and some tape and fashion a rain cover for it.
-If it seems like your balls never fly straight, no matter what you do, if you have a closed bolt gun, pull off your hopper and look down your drop tube. If you see water sitting on your bolt, clear it out, put your hopper back on your gun, and wrap tape around the join between the hopper and the drop tube. I had a hopper that for some reason gathered the water hitting it on the outside, and directed the water INTO my drop tube on my STO. I've since snapped that hopper neck so I no longer have that problem but I thought I'd point it out as a possible problem.
-You should already be wearing cleats, but if you aren't, you need to. It really, REALLY sucks to go into your bunker and then slide past it as someone is trying to shoot you out. I once did that going into a standup bunker on the 50 and I slide out the other side on my feet ("Risky Business" style) screaming in frustration 'cause I knew they were gunning for me 'cause I had rocked their world from that same bunker on the first game.
-Don't let the fact that there's mud, &/or water in your bunker affect how you play it...even if that water is nasty cow piss water and there are bits of poo floating in it. That's why you bring a change of clothes. I always laugh when I see someone get shot out because they wouldn't lay in or jump into a puddle.
-If it stops raining, be aware that the grass may not be as slick as it was when it was raining. It really SUCKS when you try for a knee-slide, you hit a dry patch and it grabs your knees and pitches you forward so hard that your hopper flys off your gun after you slam face first into the ground, and your hopper slides the rest of the way into your bunker, but you're laying there face-first on the ground about ten yards behind your bunker and three people are actively trying to shoot you out.
Just a few things that I've noticed or learned. Some people wrap their guns in Saran Wrap to protect their electronics. I sometimes will, depending on how lazy I am. I have seen instances where water getting into the On/Off switch causes the gun to freak out and shut down, or in one instance, start firing on it's own (water in the trigger switch?). I'm sure there are plenty of people on this board that has much more experience playing in the rain. Good luck and have fun...your tournament will probably be over by the time you read this.
Ray