I recently bought a "travel sized" version of a facial spray that I use so I could bring it on my holiday. But I just looked at the label and saw that it was 118ml, 18ml over the 100ml limit. I just wanted to know if that would still be alright to bring on board.
I mean, you've answered the question. The limit is 100ml, and your container is 118ml. It is therefore, according to the rules, not allowed.
As a practical matter, I can't remember the last time anyone has paid that kind of close attention to my liquids, and there's a good chance nobody will notice or care, though this depends on the policies of whatever authority is checking your bags and the particular person you get on the day. If your item is larger than 100ml, you risk having it confiscated, which means you'll be out whatever it costs and won't have it at your destination. Whether or not that's a risk you want to take is up to you.
Technically, no. 118ml is larger then 100ml.
Practically, probably. A 118ml container is barely distinguishable from a 100ml container, especially if it is not full as the contents are often more visible then the container.
Many people will tell you how they accidentally left even larger containers in the bag without issue.
The screening process is a bit of a hit and miss, you might get lucky. I suggest you have your "liquids" in the official one litre bag, if they all look the right size they will probably not look very carefully at them.
That said, I have personally seen officials carefully looking at the label and rejecting a container that was very slightly above 100ml.
I have gone through security mindlessly with a 2L water bottle in my backpack and nobody said anything. I've also had 125ml containers confiscated, because they're over the limit.
If it's worth a lot of money, don't take it, if not, just put it in the plastic bag with a few other ones that are <100ml on top, and hope they only check 1 or 2 if they check the label at all.