Gosh. I used it with a squeegee to resurface a 40' x 20' concrete pad. I think that is what it was formulated for. It can be dyed. The open time for a prepared 20 lb. bucket isn't all that long. I think if you were working around a home in narrow chinks, one bucket would harden long before you were through.
This product is for complete resurfacing. It would take several buckets. Your technique would determine how smooth and acceptable the entire floor would be. There is a learning curve. There are other products more suitable for crack repair, and there could be a considerable difference in the amount of work required.
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I'd go right ahead and do what you are planning.
You should have no trouble adding "color" to this product.
I would not. If you were putting it on fairly thick, perhaps, but even on a driveway, where some areas were spread quite thin, it will crack and chip away. Most likely a roof has enough flex that it would crack sooner, rather than later.
The Flo-Coat will not work on steps, it is a flowable product and will leave runs. Also it will not stick to the epoxy. The epoxy will have to be 100% removed from the surface before you will be able to cover it with a cement based product.