That would probably work well, or a jigsaw, but jig saws are harder to hold a straight line. The instructions from the memory foam people are for a serrated blade that moves quickly for short distances and slowly through the foam so as to not compress it in either the direction of the cut or the direction of the travel. So, a blade that is moving up and down quickly and has a very fine serrated or very fine toothed edge would probably work - smooth edges like regular knives don't work so well on it.
The more I think out what you said, the more I think a saber or jog saw on a table adapter would work well for the curved shape of the gasket to fit the mask...
Thanks, I have a good saber saw, but no band saw. ( I cream of band saws and joiners/planners but alas, I like high quality, and those are not cheap, and there are other priorities in our life at the moment - like saving for a trip around the world before we move on to the next stage...)
Started CPAP Therapy April 5, 2016
I'd Rather Be Sleeping