Water spots are a very common problem for automotive finishes and the tricky part is removing them without instilling swirls and scratches back into the paint at the same time. So let’s take a look at how to remove water spots by hand.
First you need to determine which type of water spots you have,
Type I Water Spots
Type I Water Spots are primarily a mineral or dirt deposit laying on the surface of paint. Type I Water Spots can be the results of minerals suspended in city water or well water that are left behind after the water evaporates off the finish. This can happen by washing a car but not drying the water off the paint or if a sprinkler goes off next to the car covering the car with water drop that are not dried off the paint. Type I Water Spots can also be dirt or pollution particles left behind after water from rain or inclement weather evaporates of the finish. Type I Water Spots can also be Type II Water Spots in that the water can leave both a deposit on the surface and an etching in the finish. Another way people describe mineral deposits is to refer to them has Hard Water spots, or spot left by “hard water.
Type II Water Spots
Type II Water Spots are actual etchings or craters in the paint because something corrosive in a water source has landed on the paint and was not removed before a portion of the paint was eaten or dissolved by the corrosive substance.
Type III Water Spots
Type III Water Spots are spots that look faded or dull and are found primarily found on single stage paints after a water source lands on and then pools on the paint and is usually left to dwell on the surface for some measure of time before it evaporates or is wiped-off the surface. Type III Water spots can also happen to clear coat finishes too but it’s not as common because I Type III Water Spot is either a stain or fading. Clear coats don’t stain as easily as single stage paints because they are not as porous or permeable. Clear coats can’t technically fade because they are clear to start with, there’s no color to fade.
Step by Step Procedures for removing Type I Water Spots by Hand
Different types of water spots are removed differently, so it’s important to try to diagnose which type of water spot you have first as this will help you understand the removal process and products and tools needed. The easiest type of water spots to remove are Type I and the most difficult to remove are Type II and Type III
Pictures
Type I Water Spots
Type II Water Spots
I took this photo myself when I helped Alex Fong from Corvette Forum remove a zillion Type II Water Spots out of the clear coat finish on his Corvette.
Photo Courtesy of MeguiarsOnline.com
Here's a close-up of the same photo, if you look closely you can see the edges are angled downward as this is an actual etching "into" the clear paint.
Type III Water Spots
