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I bought some of this a couple of years ago when plugging a gap that had developed in the downstairs bedroom en-suite shower cubicle and it lay undisturbed on a shelf in the workshop until a fortnight ago when I used some to replace some grouting between the floor tiles on the raised platform on which our cast iron bath sits.
It had dried up a bit since I had last used it. For some reason, I hadn't put a nail down the hole when I last used it. This normally keeps the whole neck of the cartridge from drying out. This product is designed to be used with a sealant gun. These can be a bit tricky to operate if you haven't used them before, but even beginners soon get the hang of it. Once the sealant cartridge is fixed in the gun, you simply move the opened head to where you want the sealant to come out and gently squeeze the trigger. Best not to squeeze too hard as it is easy to splurge too much out.
Once I have a little toothbrush sized trail of sealant squeezed out, I use a lollipop stick to work it into and smooth it between the tiles, making sure that I remove the excess before it dries. I also wet my finger and draw it across the top of the waterproof sealant to give a nice even finish. It was a 10 minute job at most. Easy! It will be dry enough to use a few hours later but I generally leave the area overnight to make sure it has dried fully.
I have one further job to do with this sealant before it goes back in the workshop and that is the area behind the taps in the kitchen where the grouting has gone a bit black. It's best to hack a bit of the old grouting out and then fill the bigger gap that this creates. Don't just clag a bit over the top as the problem will surely re-occur.
This is a useful DIY item to have as it allows you to successfully tackle all your internal grouting tasks. You can even get this in different colours to the standard white that we have.