I've only upset G3000 once, found it similar in consistency to cal or webber (sticky and nice) I just used it as I would any other grout with no problems, dried in very nice colour with no patching.
yep. I've had a few bags like that, but the last bag I had was really gritty. same as the 1st bag I tried when it 1st came out.. I thought they'd improved the formula, but now I'm not so sure!?! I know it wasn't an old bag, as the shop I get it from doesn't hold much stock, so it gets turned around quickly.