IMO, there is only one way to restore your bumpers - Step by step:
1. Remove bumpers and trim pieces (or mask well where not applicable)
2. Mask any parts you don't want sprayed (like red GTI strips)
3. Give a good coat of K&H Plastic Adhesion Primer
4. Wait 10 minutes, then give 3 coats black K&H Bumper & Trim Paint - It maintains absolute flexibility, and will not crack. Coat in 20-30min intervals
5. Wait at least an hour before removing masking and returning the bumper to vehicle. While it is very quick drying, don't get impatient and ruin your good job!
Personally, I wouldn't let boot polish anywhere near my bumpers
I have used the above method on my Mk3, and on the wheel arches of my Mk2 (the bumpers have only just come off the car, will be done this weekend) and in both cases, the bumpers, arches and rubbing stips look like NEW (not exaggerating)...
True, it is a bit of work, but the results last for well over 12 months, and are truly stunning.
Cheers!
J
HN
1. Remove bumpers and trim pieces (or mask well where not applicable)
2. Mask any parts you don't want sprayed (like red GTI strips)
3. Give a good coat of K&H Plastic Adhesion Primer
4. Wait 10 minutes, then give 3 coats black K&H Bumper & Trim Paint - It maintains absolute flexibility, and will not crack. Coat in 20-30min intervals
5. Wait at least an hour before removing masking and returning the bumper to vehicle. While it is very quick drying, don't get impatient and ruin your good job!
Personally, I wouldn't let boot polish anywhere near my bumpers

I have used the above method on my Mk3, and on the wheel arches of my Mk2 (the bumpers have only just come off the car, will be done this weekend) and in both cases, the bumpers, arches and rubbing stips look like NEW (not exaggerating)...
True, it is a bit of work, but the results last for well over 12 months, and are truly stunning.
Cheers!
J

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