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Old 17-03-2018, 10:23 AM   #1
feedthegoatxi
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Question Wheel refurb help needed...

Hi everyone, I'm hoping someone can advise...

I am part way through refurbing my alloys and am working on the first wheel. So far I have:
  • Sanded the rear of the alloy with 120 wet and dry followed by 400 then 1200
    Sanded the bad bits on the front with 180
    Used P38 filler as required and then sanded with 400 and then the whole front with 1200
    3 light coats of etch primer applied 15 minutes apart and then left for a day
    Sanded with 1500
    3 lights coats of filler primer applied 15 minutes apart and then left for a day

The next step, I think, should be sanding with 1500 again then grey primer.

The instructions on all the primers I'm using; hycote etch, filler and then grey primer, state 'thinly applied coats built up at 10-15 minute intervals will achieve the best result. Leave for 24 hours to harden'.

However, I've read that sanding (using wet and dry 2000?) between coats will give the best finish, should I be doing this or stick to the instructions on the can and only sand when moving from one primer to the next?

If I sand between each light coat would I have to then rinse and dry the alloy and wait 24 hours each time!!!
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Old 17-03-2018, 10:45 AM   #2
Harry_p
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You don't need to sand every coat, you only need to sand once you have enough primer on to fill any imperfections, if you find you're still sanding through to the base layer and can still see defects then you can prime that spot and feather the edges in. Then once you've got a smooth even coat of the filler primer you can use the grey, once you've got a couple of coats of that so you can key it in before top coat.

If you sand after every light coat you'll be there forever!

Also 1500 is far too fine between coats imho, I'd only go up to 800 max with aerosols.

Save the 2000 for wet sanding the lacquer a couple of weeks later when fully hardened before a final polish
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Old 17-03-2018, 11:21 AM   #3
steveo3002
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got all the grits wrong ...1200 and 1500 is too fine and wont provide a key

id prime over 600 and paint over 800 , nothing to be gained going any finer
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Old 17-03-2018, 11:41 AM   #4
feedthegoatxi
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thanks Harry, thanks Steve...things are a lot clearer
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