Thursday, 3 August 2017

Acidic / Alkali Wheel Surface Damage


These chemical stains are frequently milky, black, or greenish in appearance. They result from using acid or high alkali content cleaning solutions.

 This type of surface damage usually entails refinishing. However, the following product and procedure have been found in some cases, to improve the appearance of acid/alkali stained wheel surfaces; be cognizant that in some instances you may only achieve a < 50% improvement and in some more. For wheels that have milky or hazy staining caused by these types of chemicals try the following: Use caution with chrome wheel finishes as the plating is very thin and using harsh abrasives could remove it.

This procedure will improve the appearance of the wheels and may, with repeated applications, restore the finish dramatically. For wheels that exhibit spotting from road chemicals, the above procedure may marginally improve the condition but will not restore the finish or remove the pitting. In this type of staining the wheel, finish has actually been removed in spots and no manner of cleaning will restore the finish.

The following product and procedure have been found in some cases, to improve the appearance of acid/alkali stained wheel surfaces. For wheels that have milky or hazy staining caused by these types of chemicals try the following:

1. Wash the wheels (See Note 1) thoroughly using clean water and soap or detergent and then flood rinse the wheel surface with clean flowing water.  
2. Rinse the surfaces with a medium strength alkaline solution
3. Dry the wheels completely.
4. Apply Menzerna SF 4500 polish with a black LC foam pad
5.  If the finishing polish doesn’t’ remove the spots, try 3M Chrome and Metal Polish #39527 (See Note 2) with a clean terry cloth towel. As you apply the polish, the staining may diminish.
6. When dry, buff off the polish with a clean portion of the towel.
7. Repeat application of the finishing polish until satisfied with the results. If continued applications fail to improve the appearance further discontinue use (See Note 3).

This procedure will improve the appearance of the wheels and may, with repeated applications, restore the finish dramatically. For wheels that exhibit spotting from road chemicals, the above procedure may marginally improve the condition but will not restore the finish or remove the pitting. In this type of staining the wheel, finish has actually been removed in spots and no manner of cleaning will restore the finish.

Notes
1. DO NOT attempt to clean hot wheel surfaces; allow cooling down time, otherwise, you may cause structural damage to the wheels and cause the rotors and/or callipers to warp, making them inoperative

2. THE 3M polish required for this procedure contains an extremely aggressive cleaner. The wheel surfaces must be clean prior to application to avoid scratches. This cleaner will reduce the coating thickness and if used incorrectly may remove the surface finish entirely.

3. Begin with a small section of the wheel and with light pressure buff off polish and examine results. ONLY apply with sufficient pressure and time to remove enough staining that you are satisfied with the results. Some wheels may be stained to the extent that you may only achieve a < 50% improvement while others may be able to be restored to the original lustre. In all instances; only apply until the results are satisfactory.

Information Source - GM Customer Service

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