Concrete Cracks. No way around it no matter what you do. That's the reason for saw cuts and groove's. It will ALWAYS crack, you just do what you can to control the cracking.
The black spots at the time are no big deal, as they should be gone now. That is part of the "bleaching" process (when...
Alright, Here is what I did:
I have Four 8ft Light's in my garage, when I wired them they all ran off one switch (didn't previously put much thought into it). Problem being... when the door is open the one above the door would be blocked and rendered useless. Just wasting 220 watts of...
I'm the same. Use mine almost everyday and they work flawlessy with the Lithium batteries. I love the whole Ryobi One+ setup. My P260 is probably used more than any other power tool I own. And I even have an 80 Gallon IR 2 stage air compressor....
This is the one I use...
http://www.sears.com/craftsman-incandescent-work-light-with-30-ft-retractable/p-03473943000P
The blue wire stays flexible even when super cold in the garage
This is mine.. Got a 50" Plasma on an articulating wall mount from Monoprice. I don't have a problem with temperature since my garage heater only goes down to 55 Degrees ;)