Getting ready to remodel property for flip sale and need to update bathrooms. Need a cheap solution to replacing outdated gold/chrome facuets, gold shower glass trim and gold accessories.

Home Depot is the cheep way out.
There are many products that you can use to update what you currently have. There is no magic paint or material that would cover this stuff if that is what your after.
A new shower door is only a few hundred dollars faucets can be had under 30 bucks and the rest about the same.
But if the current fixtures are in good shape and its just the color your concerned about. A fresh coat of paint on walls and peoper staging will blend in the gold color your worried about.

If your changing colors be sure to go with brushed nickle over chrome as its much more expensive looking. Cost a bit more the chrome but the cost is well worth it.