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You can apply waterproofing over paint, but you won't get as much protection as you would if you painted the surface with a waterproof paint from the get-go. Not all waterproofing methods are compatible with painted surfaces, and they may not adhere well. This is especially true if the paint is glossy, old, or flaking. Waterproofing sealers are primarily meant to be applied to porous surfaces, like concrete, wood, or brick. 

Some methods of removing paint from metal that use physical force, like scraping or grinding, may damage the metal. Other methods like chemical strippers or acids are unlikely to damage the metal underneath, but take care using any method to strip paint to minimize the chance of damage.

While the EPA provides guidelines for homeowners to perform DIY lead paint removal, it is a risky process and generally not recommended due to serious health risks and strict regulatory requirements. The process requires precise safety precautions, such as wearing a respirator and protective eyeglasses, creating sealed exits, and using a HEPA vacuum for cleanup. To ensure the job is done safely, effectively, and in compliance with regulations, it is highly recommended to hire a professional lead abatement company. Certified professionals have the necessary training, experience, and specialized equipment (like chemical strippers and HEPA vacuums) to handle and dispose of hazardous materials safely.

Professionals may use a variety of methods to remove old paint from surfaces, often depending on the size and complexity of the surface. Paint scraping in combination with a chemical paint stripper is the most common method, but experts might also use heat or steam to loosen everything before peeling the paint off. Some might just sand off the old paint if the surface is relatively flat and easily accessible.