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Old 14-12-2017, 10:24 AM   #11
voon
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Acid dissolves lime. So I'd go with a bit of vinegar etc on spot repair. I would however not regularly wash the entire car with an acidic product, or you'll look at rust heaven in places it ran to below.
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Old 14-12-2017, 11:03 AM   #12
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Removal of Water ‘Spots’

There are two categories of water mark (the so-called water spots)

Stage I (Surface) Corrosion
[: defined as a surface with light to moderate corrosion damage to the paint surface]

Stage II (Sub-surface) Corrosion
[: definition when the dirt/corrosion deposits are no longer on the surface but have started to break down the molecular structure, leaving an etched or white haze on the surface( a concave circular mark ) after the stain has been removed, with moderate to serious paint damage]

Surface water spots- (Stage I Corrosion) alkaline watermarks consist of calcium (Ca) and magnesium (Mg) both of which are basic (alkaline pH 10) that alight on the surface; ultraviolet (heat) radiation (UVR) will leave a white ‘water mark’, the minute crystals bond to the surface, they will not wash off as they are insoluble and if left for any length of time they will etch the paint film surface leaving a concave circular mark, remove surface deposits with detailer’s clay and an acetic acid pH 2.0 (vinegar) to naturalise the alkaline

A chemical paint cleaner Swissvax Cleaner Fluid Standard - a non-abrasive paint preserving solution containing heavy polishing oils that will remove more aggressive surface water marks, swirl marks, light scratches, tree sap and tar spots and cleans the paintwork surface

For stubborn marks use Optimum MDR Mineral Deposit Remover, which eliminates the need to use abrasive polishes for the removal of light water spots MDR is a thick, non-abrasive gel that clings to automotive surfaces and dissolves water spots and other water-based contaminants.

b)Below surface (etched) spots- (Stage II Corrosion ) are caused by an aggressive alkaline or an acidic solution (acid rain, bird excrement or industrial fallout) causing a chemical reaction, if left for any length of time they will etch the paint film surface leaving a concave circular mark. Unlike water spots which typically have a white outline of the spot, acid rain etching is smaller and you can see the damage in the clear coat.

If the clear coat has been etched by mineral deposits or acid rain it will require an abrasive to remove them

Reactivity [:the chemical reactions of two or more substances that interact with each other]

If you add heat and moisture to either an acid or an alkaline it becomes more aggressive

Last edited by TOGWT; 14-12-2017 at 11:05 AM.
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