I don't overheat, but I dump when the engine is turned off on a hot day. It's not too much dumping but it's more than I care to clean up off the garage floor.
You should probably install an overflow bottle, or better yet, a recovery system. A generic recovery system can be bought at Pep Boys, NAPA, etc. for under $15. The only other thing you'll need is the correct radiator cap for a closed cooling system (post-1971), and nearly every auto parts store carries those.
