I have concerns over why our beers are not carbonating properly. One suggestion was to check and make sure the bottles are sealed properly. What might be a good way to do this?
If you're using a butterfly capper, check to make sure you're pressing hard enough. There should be a slight ring-shaped indentation in the cap after capping a bottle.
An easy way to check once they're capped is to simply store a few upside down. If there's a leak, the gas will bring some beer with it as it leaks out the cap.