Re: Touch up paint.
Get a fine brush from an art shop.
Try to T-cut out the scratches before trying anything else.
Clean the area with solvent to remove wax etc
Use the colour as sparingly as possible in the scratch.
Rub down between applications using 1200 grit paper, soap and warm water to remove the overspill from the brushing.
Once the colour is correct continue to fill until level using laquer.
Eventually it will go flat with repeated coats and sandings.
Leave for a few days to harden.
T-Cut to a shine, then wax to remove T-cut residue.
(No prizes for guessing what I was doing last weekend)
The match isn't so important if you are only using the colour to fill the scratch and not the surrounding area.
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