Cutting And Polishing Fresh Clear Coat
Posted 08 June 2019 - 09:05 AM
Clear coated about 10 days ago, sanded out any runs and orange peel with 2000 grit paper wet and then I've used indasa compound on a white foam pad but it really doesn't seem to be taking the 2000 grit scratches out of the paint work
Any tips or suggestions on what I've messed up, not long enough with the polisher and compound or?? I tested a patch with indasa polish on an orange pad and 3m rossa on a black pad and the shine is there but there's still sanding scratches
Thanks in advance
Posted 08 June 2019 - 10:15 AM
I'm not familiar with Indasa compound, but for this type of work at least 2 and often 3 grades of compound are needed.
First, a heavy cut compound designed to remove sanding scratches. This will often leave the finish looking hazy, so follow up with a light cutting compound. For some product lines or color schemes, this is enough, but usually it's best to finish with a fine polishing compound.
If the use of heavy cut still leaves clear sanding scratches visible, it's possible that you had contaminants on your sanding paper or perhaps tried to stretch an old sheet of paper a bit too far. Try just removing these with fresh paper and clean lubricant (water with a bit of soap) and then polish again.
Posted 08 June 2019 - 10:23 AM
Edited by Steve220, 08 June 2019 - 10:23 AM.
Posted 08 June 2019 - 10:46 AM
How long did you polish for?
If sanding with just 2000, you need to polish for a lot longer with a reasonably course compound to remove the scratches.
Keep topping up on compound and keep going and they will slowly polish out. You really want to aim for the panel to become warm from the polishing.
I would recommend polishing up in sections so that you can really concentrate the polishing on each section, say 5"x5" sections at a time.
If the scratches are really deep, then it could be contaminated sandpaper. Even the smallest piece of grit on the paper can leave deep scratches which will be very hard to polish out.
You could also be using too much pressure when sanding which will cause quite deep scratches.
You can work to progressively finer papers but you will probably find that if the scratches left from the 2000 are due to heavy sanding or contaminated paper, then the finer grades just won't touch it.
Are you using plain water with the 2000? I find that a drop of car shampoo in the water helps ease friction and keep soaking the paper constantly to avoid the area drying up too much.
Posted 08 June 2019 - 11:17 PM
Posted 10 June 2019 - 02:23 PM
to be honest i know a lot of people think it is a good idea to give the paint or clear a long cure time prior to flat and polish.
But when the paint gets too hard it is much harder to bring up after flatting, it is better to do it sooner than later, and if any flatting marks do re-appear after a week or two, they are much easier to deal with. Than starting from scratch excuse the pun
Funnily enough i an encountering this problem today on a series 2 landrover we are doing at the moment, the panels have been sitting around painted for about 8 days, ambient temps have been quite high, the paint is very hard, i would say it is taking twice as long as normal. i should have done them 5 days ago really.
Above suggestions about moving up a few grades of paper may well help, or as Ben mentions some nice soapy water in a squirty bottle and make sure the panel is scrupulously clean, before any flatting. and doing a small area at a time, if your sweeping across an entire panel you will never get them out no bigger than ten inches square at a time.
Farecla's new 360 compound is very good
the darker the colour the harder the job will be.
Edited by [email protected], 10 June 2019 - 02:25 PM.
Posted 13 June 2019 - 11:01 PM
I found 2k paint very hard to polish and the finer sanding made a massive difference just ensure all previous sanding marks are removed at each stage and clean properly before going to next grade. But I am no expert at this.
If you are doing it all by hand then use each finer grade at 90 degrees to the previous it’s easier to see when all scratches are gone.
Edited by Daz1968, 13 June 2019 - 11:01 PM.
Posted 15 July 2019 - 09:55 AM
thanks for all the advice, ended up going with 3000 and polishing a little longer and was getting some good results but with a few places that i wasnt happy with i decided to rub the whole car down again and re-do the clear coat over the weekend. much better result too so maybe a quick run with 2000 and 3000 wet and a polish and it's good to go!
thanks again guys!
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