I only do RC prints - prints I made 30 - 40 years ago on RC are still good and I don't think anyone is going to look at my pictures in 100 years time, so FB is not for me. So I use borderless easels with Spraymount adhesive. Most enlargers will only give you 20 x 30 inch enlargements at the height of the regular column i.e. without floor or wall projection; or a cranked column extension if you have the head-room in your darkroom. But, a 20 x 30 inch RRB easel needs a couple of inches around the edge, so that 16 x 12 inch is max you will get at the top of the column with an RRB easel. With my borderless easels I can get 20 x 16 inch borderless prints, though there is only minimal scope for cropping. I hate paying for paper with nothing on it; I can border the picture with the mount. If you want to do FB I think you need an RRB or similar blade easel, to keep the paper flat; re-positionable adhesive keeps RC paper flat without difficulty, unlike FB paper, in my experience
<http://www.apug.org/forums/forum41/6...nlarger-3.html> (there was a url link here which no longer exists)