DIY Bathtub Refinishing

[ruanddu]

This is a follow-up to a previous post -

viewtopic.php?f=11&t=100270

I have decided to go DIY route to save money. I'd appreciate your recommendations on brand/part # of product you used to refinish your bathtub?

We have an old cast iron tub and fiberglass surround. I am hoping to use the same paint for both applications. Looking most closely at Rustoleum 1 qt epoxy at Home Depot, model # 181463.

Thank you.