This reminds me of a conversation I had with Walter Birdsong many years ago. We were talking about the subject of how much lubrication firearms need.
His answer: "Very little..."
I asked why, because at the time we were all gooping up our 1911's with oils and greases of various sorts. We'd wet the outside of the barrels between it and the bushing. Or, if you had a bull barrel, between it and the slide. We'd also grease/oil up the frame rails.
His answer: "When you shoot a gun, the result is burnt gun powder that turns into carbon. The carbon builds up and mixed with too much lubricate, and it turns into lapping compound..."
He explained that it'll actually wear your gun out quicker if you're like %99.9 of shooters out there who use too much.
I'll put your minds at ease, fellas. I use the stuff and LOVE it. I have two viscosities, the "lite" and the "standard". I use the light most often, and use it on all of my guns. The stuff is fantastic.
It does seem thick once you look at it in the tub, but like Cliff said, you don't need much.
After using the slide glide, I have noticed significantly less wear on my guns. An added bonus is cleaning becomes MUCH easier. The slide-glide seems to trap all the carbon so it all just wipes away, no more scrubbing with brushes. Just wipe off the old lube and put some fresh on the rails and other places that require lubrication.