I was prying open the can and making a mess trying to get a small amount onto the pallette. Also, the paint was very thick and seemed hard to work with.
GM is talking about the correct paints I am using. You can see the type of pots to the left on the image below - they are a screw off and push down to close. Using a good old fashioned tin lid would indeed be painful I think.
I add a little water to the pot, shake well and when I unscrew the lid more than enough paint has gathered there to work from. Every now and again I put the lid back on and shake again. I do not find it hard to paint with at all, the purple I used on my matchlockmen for example was very smooth and flowed well.
I do of course have many Games Workshop paints for the odd colors, metals and black, but the majority of everything else are done with house paints.