Do you have any of the fabric? If so, I would wash the purse, cover the bottom with some of the fabric then cover it with scotchguard.
If you don't have any of the fabric, then you might want to cover it with some vinyl and that might protect it. You can either hand sew the fabric to the bottom, as most people wouldn't be able to see the stitches, or perhaps seam rip the bottom off, replace the fabric using the size of the piece as a template. Good luck!
I don't know the type of fabric your purse is made from, but mine is a brocade silk material and I wash it in the washing machine on warm water setting and cold rinse cycle and do not put in a clothes dryer. It hasn't shrunk and it has vinyl straps.
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