[GuyBFF]

It's weird they'd paint it then! Paint also has a negative effect on lowering the cooling ability of the core.
It does however look like solder on there web site due to the thick silver paint. I stand corrected.
On yours did they paint the outside (and the inner fins still look copper) or is it all painted? I make my own rads, but if these are good I'll recommend them... you're right they are priced good.