So I have only 1 hand, and had no trouble opening the container, so I'm not sure what some users are struggling with... pull off the tab, all the way around, then pry the lid up, one flap at a time. I just used my fingers, but if you don't have the finger strength for that, you might need a screwdriver to pry the segmented flaps up, as they're sturdy so the lid is watertight.Another user is right, it WOULD be nice if the powder was in a bag, so you could just mix in the product bucket, but I used a sacrificial bucket with mixing ratios printed on the side, and that way I now have some clean reusable watertight buckets!My garage used to be just a garage pad, and was exposed to the elements for 40 years. There was one big spall about 1'x8"x1.2" and lots of smaller spalling and several cracks, from 2" to hairline wide.Based off my research, it seemed most products either are crack fillers/sealers OR surface/spall repair, and most surface repair products don't seem to have the structural/traffic rating that I need AND aren't rated for the depth of the damage I'm repairing...This product seems to hit the sweet spot of structural strength, spall depth rating, and crack repair.I don't really care about waterproof ratings, but it's nice that it's waterproof if I bring a wet vehicle in the garage.I chased most of the medium cracks with a used tuck pointing grinder, which is probably overkill, but I really wanted this stuff to get into the cracks and stick well. I actually made the whole spall 1" deep so the edges weren't super thin...I found the product to mix easily with a drill mixer, and be very workable. Hopefully I didn't get too much entrained air in the mix, but I think it's ok... I had the whole batch placed within 15 minutes, though, and it's essentially an epoxy, so keep an eye on your batch times.I ran out of product before I could get onto trying to work the stuff into 1/4" deep spalls, so I'm not really sure how it does in thinner placements.So there's no confusion, the dark spots are oil stains, the white liquid is oil eater, and the light area next to the north-south crack patch is surface grinding I did to remove old, failed, repair mortar.If it starts to break up or delaminate I'll edit my review, but for now (as it's still curing) I'm very satisfied!Edit: I needed more, looking back I wish I'd just ordered a 70lb unit, which doesn't seem to be sold on Amazon unfortunately!My second order was different from the first. The first buckets were made by Ropak and opened easily! The second batch was packaged in containers manufactured by Century Container Corporation, and I just said F-it after a few minutes of fighting, and just cut the rim and seal off the lid itself. Vastly inferior container... similar design, but the flaps are much stiffer, and can't be pried up with fingers...