Do manufacturers overestimate their coverage?

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I had a small back bedroom completely reskimmed about 6 weeks ago. I've just put a mist coat on using No Nonsense Trade Contract Matt (Brilliant W). I didn't thin it because the tub said it wasn't necessary for a mist coat. The tub says it covers 10-12 sq m. per litre. I've measured my back bedroom carefully and all walls and ceiling comes to about 27 sq m., certainly no more than 30 but I've used at least 8 litres of a 10 litre tub. I put it on fairly liberally but not too much I wouldn't have thought. Do the manufacturers generally grossly overestimate the coverage of their products?

I'm now intending to put a single coat on of Dulux Trad Vinyl Matt (Pure Brill W). I've read somewhere that you can get problems using different makes of paint/emulsion but I also read that you can use any make of cheap emulsion for a mist coat so I'm not anticipating any problems. Already with the mist coat the bedroom looks great apart from one or two places where the ceiling meets the wall and the paint has cracked, I think perhaps because I've put it on too thick. But would these disappear with a coat (or maybe two at those points) of vinyl matt?

Thanks for any advice or comments.
 
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Yes, manufacturers are always using the best possible case scenario for coverage; much like you'll never hit your car's best MPG. Disregard the coverage estimates and work off how much you're using.

If you've used the paint heavily when cutting in, you'll certainly get cracking as you've described. I'd sand it back and repaint the offending section - multiple thin coats are better than a couple of heavies.
 
Yes, manufacturers are always using the best possible case scenario for coverage; much like you'll never hit your car's best MPG. Disregard the coverage estimates and work off how much you're using.

If you've used the paint heavily when cutting in, you'll certainly get cracking as you've described. I'd sand it back and repaint the offending section - multiple thin coats are better than a couple of heavies.

Thanks for that. I sort of assumed that overestimating was the norm but I'm still surprised that I seem to have got only a third of the coverage they suggest can be achieved.

I'll take your advice and sand where it's cracking, then remist those bits and then vinyl matt everything.
 

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