Gary,
Unfortunately that Airmodel site has been like that for about 4 months now. I have tried contacting the webmaster or host without any luck. Too bad, as it filled in the (many) blanks IPMS Stockholm has.
Here's a website that is sponsered by Hometime-Hobbies that compares various manufacturers against Humbrol, you must then compare the Humbrol to the brand you want.
Good luck!
Bill