Please help.

After scouring these forums for advice on lubrication I decided - to temporarily curb squeaks, to use WD-40 and White Lithium Grease on my 1970s Schwinn Suburban 5spd.

After placing the bike upside down and thoroughly (perhaps overdoing it) lubricating the front and rear hub/cassette with WLG (and WD-40ing the chain, cassette, brakes levers and calipers) I pumped up the tires using an air compressor.

From earlier lurking on these forums I garnered that my bike's tires should run (if my memory is correct) a~100psi. After pumping up the rear to 100 I started working on the front, and before I finished pumping up the second tire the rear popped/burst (quite loud).

Now, all of this is background. What I am concerned about is WLG being both inside the tire (between the tire and tube) and INSIDE THE TUBE. Now, maybe the previous owner pumped it up with slime!? But I could not differentiate between the white grease I had just put on the hubs and the goop oozing out of the tube and around the inside of the nylon tire. (Same viscosity, smell.)

There was a good deal of dripping going on while I was lubing. Is it possible that WLG dripped onto the wheel and into the tire and the tube during extensive lubing just prior to pumping/popping my tires?

Any possible explanation on greasy white slime being inside my tube after it popped? Or between the tire and tube? (It was both places.)

By the way, the reccomended max PSI on the tire that popped (which I managed to make out afterwords from the cracking rubber was 75PSI not 100PSI, although the front tire had a max PSI of 95.)