Terry,
New blades don't guarantee sharp blades. I use a FrameSquare fillet chopper and I hone the blades of the chopper on a very fine ceramic stone. It is amazing how "not sharp" sharp blades can be.
Spyderco sells the very best ceramic stones and they will last much longer than your lifetime if properly cared for. (Like not dropping them on a concrete floor!) They are priced higher than most stones but, once you use one, you will throw all the others out! They use no oil or water, they are used dry and can be cleaned with some Comet and a Scotchbrite pad when they become dirty or clogged.
The keyk to maintaining the edge of a cutting tool such as a fillet blade or a knife is learning to maintain the angle of the edge as you sharpen the tool. That takes some practice and concentration but, once learned, you can put a scalpel's edge of any cutting tool if the steel is of good quality.
I wouldn't be without my set of ceramic stones for any reason.
Framerguy
P.S. Some so called Gesso is not gesso at all but a very hard type of plaster and it is very brittle to both chopper blades and the saw. These are hard to cut with the sharpest of blades and I immediately remove the samples and pitch them when I find one to be this way. We have enough headaches to contend with in framing without adding to the assortment with inferior moulding finishes.