The water spots didn't reappear, they didn't go anywhere to begin with. They may have lessened some but they were still there all along. Whatever light source that you recently used to see these water spots is what you should have used to check for them while you were working on them. I have experienced water spots that had to be wet sanded out because of how deep they were. This is not abnormal for one reason, which applies to many people's paint. That is, if you allow water spots to sit on the paint long enough and your paint is full of scratches and swirls, then the water spots will etch deep into the clear coat
because the scratches provide an avenue deeper into the clear coat. Allow me to elaborate.
View a scratch in your paint or clear coat like a small rip. If there were no rips in your paint or clear coat, the water spots would sit on top of your paint or clear coat and begin the etching process from the top. If your paint or clear coat had wax on top of it, then the water spot would start the etching process while sitting on top of the wax. A water spot sitting on wax would have to eat through the wax and then into the clear coat or paint. That's a much harder scenario for the water spot, especially if you use a good wax such as a long lasting sealant.
Now let's look at a water spot sitting on top of some jacked up paint or clear coat. By having a rip in your paint or clear coat, you provide an avenue for the water spots, deep into your paint or clear coat. That means that not only does the water spots begin the etching process on top of your paint or clear coat, it also begins that process deep into the rips (or scratches) of your paint or clear coat. Thus, jacked up paint allows the water spot an advantage to get deep into your paint or clear coat and will require a more aggressive plan of attack in order to rid your paint job of them. This also requires you to remove more material, a scenario that isn't good if you have no clue as to how much material you are starting with or how much material you are removing. Without being able to determine the amount of material that you are removing, you are a blind man working and THAT is not a good situation.
There is a way to find out how much material you are starting with and how much you are removing. It's called a paint thickness gauge. Now paint thickness gauges come with various abilities but there is only ONE on the planet that I know of that would work in this situation. It is called the
DeFelsko PosiTector 200 B or C/Advanced (the B or C designation denotes the material that the panels of your car are made of). With this device, I can detect the thickness of the
primer, base coat AND clear coat on any given panel of my car. Since my car is made of fiberglass, the C/Advanced is what I use to take those measurements. By using this device, I can use aggressive measures on my paint to remove deep imperfection but at the same time, see EXACTLY how much material I am removing every step of the way. This allows me to work and determine if proceeding is safe, or if I should leave well enough alone because of the depth of the damage. Clearly an advantage for me but not my wallet. This device will set you back in the neighborhood of $3000.
So as you can see, the condition of your paint will determine just how bad your damage can be. Also, the amount of time you wait between when the damage occurred and when you finally decided to address it will also have a bearing on how difficult the repair will be. With paint care, addressing a situation within the first 24 hours can be critical. The damage starts immediately and you don't want to allow it to proceed unabashed.
Now as to what you can safely try to fix it? That depends. I have never seen you work on paint, I know nothing of your abilities and I do not know if your technique is solid. A solid technique is way more important than the product you are using. A person using a crappy product with a solid technique is going to have much better results than someone using the best product in the world and a lousy technique. What this means is, you could already be using a combination of products that will fix your situation. Without seeing you work, I cannot say. However, if your technique is solid and those products are not working, I would give the
Meguiar's Microfiber System a try.
The only catch is you have to be working on OEM paint. If you are working on a aftermarket paint job, that system is NOT for you. Also, that system is made to be used with an orbital polisher, such as the PC-7424XP.
There are of course more aggressive options that you can try but I would never advise you to try any of them, especially since I know nothing of your paint correcting abilities. My motto is, "Never tell a guy to do something to the paint of his pride and joy that I would not allow him to do to mine."
