refinish stain and seal a cement floor?
if you are happy with the color after sanding them you dont need to stain them. you can just apply the varnish. if you want to change the color, and you might because they tend to look very light after sanding then you have the chance to pick the right shade of wood you want. plus after the sanding all the hard work is done. I would stain them just so the color is even.
Are you asking about the process? Clean the floor first. If you use a high grade cement/garage floor paint, such as an epoxy base the sealer is in the soulution. No offense, but it makes no sense...TO ME, to do a multi step process. Steven Wolf If you insist on a stain, it should be an acid etch bases product to actually STAIN, not just coat, and don't even bother with any latex based products.