How about removing the paint from the security door and repainting it

On the anti-theft door, at least 6 layers of paint, 3 degrees of anti-rust primer and 3 degrees of topcoat... It is not easy to polish off the original paint, and I am afraid that it will not be beneficial.

Whether it is electric or sandpaper, the original primer will be worn off.

According to you, the paint you bought does not match the original paint composition, and there are many types of topcoats, such as alkyd, propionic acid, etc., some of which are compatible. Therefore, it is easy to touch off.

It is recommended to consult the building materials supermarket and buy a good paint. However, what you have sprayed before, it is difficult to remove it completely.

Analysis: At least 6 coats of paint on the security door, 3 coats of anti-rust primer and 3 coats of topcoat.

Solution: You can try to use paint remover and sandpaper to slowly grind the paint off.

Paint strippers are required to remove paint from the surface of security doors.

No matter what method you use, the result is cruel, because your home is not a factory and does not have that condition. I suggest that instead of spending money on tossing, it is better to add some money to re-order and replace one you like. (It's rare to decorate once a day, and it looks uncomfortable to go in and out every day).