Paintwork scratch's easy

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mr mugello
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Paintwork scratch's easy

Postby mr mugello » Wed Apr 19, 2017 10:19 pm

New paintwork. Looks great first impressions. Asked and was told it would be in solid two pac finished with a clear coat, as this is what he like to use on older motors and restorations. When polishing it is easy to get scratch marks and swirls in the coat. When rebuilding scoot I scratched the rear light unit badly, hold my hands up my fault with a screwdriver. I used a Meguiars Ultimate compound, clear coat safe, to try to remove scratch, but this removed the top clearcoat to show a matt black base colour, which had to be taken back to be resprayed ! I thought solid two pac was less prone to scratching. What would be causing my paint to scratch easy ? Anyone else had similar issues .Thanks.
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fluff34567
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Re: Paintwork scratch's easy

Postby fluff34567 » Thu Apr 20, 2017 12:13 pm

Clear coat stays soft for quite a while so I would certainly avoid any form of polishing for a few weeks at the earliest. Clear coat over a single colour top coat is a bit odd IMHO.
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mr mugello
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Re: Paintwork scratch's easy

Postby mr mugello » Thu Apr 20, 2017 12:35 pm

He mentions the use of high solid 2k laquer over top of water base colour. Been several months. Paint marks so easy. Is black though. If he has used modern water based laquer, could this be the reason why ?
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fluff34567
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Re: Paintwork scratch's easy

Postby fluff34567 » Thu Apr 20, 2017 12:52 pm

I have sprayed water based paints and laquer recently and it's hard after a week. You can feel the difference with your finger nail.

I use black as a guide coat when blocking after using filler primer but only to show the high low points.
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10 inch Terror
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Re: Paintwork scratch's easy

Postby 10 inch Terror » Thu Apr 20, 2017 1:13 pm

I've just painted a set of forks and front mudguard in 2K Ford ST orange with a 2K clearcoat on top. It was hard enough to cut and mop polish after 72 hours. I went by the manufacturers recommended mix ratio and dry times. If the wrong ratio of clear to hardener was used then it'll never be hard enough to polish. If anything a clearcoat should be harder than any paint finish.
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mr mugello
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Re: Paintwork scratch's easy

Postby mr mugello » Thu Apr 20, 2017 2:08 pm

I feel it's waste if time going back to sprayer. Now bikes rebuilt. He's got all the excuses under the sun, from previous issues. Won,t be recommending or using again.
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Padge
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Re: Paintwork scratch's easy

Postby Padge » Thu Apr 20, 2017 5:29 pm

As mentioned before any 2K lacquer should set hard within 48-72 hours, there are a few reasons it may still be soft, wrong mixing ratio, mixing lacquer/hardener types (HS lacquer and MS hardener/thinners etc.) If it's a HS lacquer, was it baked or air dried, some HS lacquers need to be baked to cure properly
Lacquering a solid base colour is the norm nowadays with water based, but personally I prefer to do clear over base rather than solid colour with solvent/2k paint even with solid colours
do you know the actual lacquer that was used ?
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mr mugello
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Re: Paintwork scratch's easy

Postby mr mugello » Thu Apr 20, 2017 6:26 pm

No mate. Clear coat is ultra thin as I have found out. Using meguiars scratch x instead of their ultimate compound, which gets the fine marks out ok. Just feel I have to be so careful when cleaning, as a soft cloth even puts the marks back in if used with too much pressure. I just got all the talk of how it is baked on solid and will buff up fantastic from them. Stand went back last week with large flakes coming away. Dreading if this happens to main frame. He blamed that on oxidation on the stand . Nothing they done wrong !
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Steve t
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Re: Paintwork scratch's easy

Postby Steve t » Thu Apr 20, 2017 9:00 pm

Sounds to me like they've used 1k clear coat. 2k clear over base is as hard as nails when fully dry you should be able to flat 2k with 1200 wet and dry and buff back up to a shine if it's soft with your finger nail somethings wrong. sorry it sounds like bad news
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mr mugello
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Re: Paintwork scratch's easy

Postby mr mugello » Thu Apr 20, 2017 9:22 pm

Not good. Can't see me getting any recourse . Looks like I'm snookered with it.
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