Please don't! You should only hire a professional to reglaze it. https://bachelorettepadflip.com/2014/07/03/glazed-over/
You can but you will need to get paint specific for plastic. The hardware store can help, but I prefer to use a spray paint.
Evelise....If you are talking about a small plastic tub you can use spray paint made for plastic and it will work but if it is a bathtub.....I wouldn't!
You Absolutely can. There are so many paints are available in the market but go with the one is recommended for plastic. Don't forget to seal it with the sealer once your paint is dry though.
Hello. Plastic or fiberglass?
Rust-Oleum does make a product that is approved for fiberglass.
Please consider looking over these links below and consider the Amazon website which has questions and answers along with reviews which may help you decide is the product is right for you to use. I have use the Rustoleum helpline they are very knowledgeable and educated people that might help answer your questions or concerns before you consider the project.