I've heard that people use fluorocarbon on a whole spool even though its for making leaders. Is this type of line good enough to put on a whole spool, is it light enough to use for light lures??? need everybody to answer.

I use it on full spool. Use flouro for jigs and plastics.

I use flouro for almost everything, but not for the whole spool, I use cheap backing line so I don't waste the flouro.

I use it for pretty much everything except topwaters.

Yep - mono for topwater and braid for a-rigs and froggin...

would it rot in saltwater cause I'm going fishing in salt soon?

Coming from a freshwater bass perspective, I rarely ever use flouro as a leader but maybe my applications are a little different. For a carolina rig, I'm generally looking to add a leader between 12-18 inches (give or take) that keeps the bait elevated. Therefore, I use mono and not flouro. Also, like others mentioned, I'll use mono or braid on a top-water depending on the surrounding cover.

When I use flouro, I've been using it on an entire spool and never using backing but it's not a bad idea if your looking to save some costs on spooling. I've heard of using a flouro as a transition leader from braid. Mostly for finesse presentation, like a dropshot, but it's never been my own personal preference. I usually buy large spools of flouro at once, so I don't really think twice about re-spooling an entire reel.

I dont care for flouro. It can be difficult to manage and I have no confidence in knots with flouro, especially with heavier baits. Flouro has improved over the years but you still hear about the same flaws with it. May be hype and may not be but I have caught just as many on good mono and coplymer. I think it just goes back to the confidence thing. Lot of people use it and like it so it may just come down to a personal preference.

Yep

I'm with Saks on this one. I tried it when it first came out. I lost 5 nice fish in a row. T's most likely improved over the years but mono or braid do fine for me.

My brother was a guide in Rockport for seven years before he retired. Always used braid with a floro leader. It won't rot and if you use a six foot or so leaded it will work for anything.

Personally, I despise fluoro, so seldom use it. On the other hand, lots of big bass have been caught with it, so it can't be all bad. Isn't it a great thing that we have a choice!

It depends on the fluorocarbon line you are talking about. Some fluorocarbon line is made only as a leader material and is usually sold on small spools like 25 yards or so. Then you have the rest that are made to cast with. I use 15-20 pound test Invizx and it is great stuff. Use a San Diego Jam knot, or a Fishin fool knot, or a double Pitzen knot and you should not have any problems. Don't fill the reel spool as much as you would if you were spooling up with mono. Fluorocarbon seems to try to straighten out and will get loose on the reel if you have too much on it. Whether you fill the entire spool with it or use something else as a backing is up to you.

I use Invizx fluorocarbon, PLine CXX and McCoys copolymer line, and Power Pro or Suffix 832 braid.

I despise the stuff too. Mono is so cheap and braid works better when I need an application for low stretch line. Basically I only use something other than mono for frogs, Carolina rigs, and a-rigs.

I don't do much jig fishing or I'd probably bite the bullet and find a decent line that actually held a knot.