Touch up paint advice

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I have recently acquired a metallic diamond white Mercedes and have purchased a touch up stick from the dealer. However, the paint is very weak and almost transparent and I'm having problems covering minor chips.
Is this due to this being a pearlised paint finish?
Any suggestions?

[disad-vantage-d]

That's what I thought. I was supplied with the diamond white and a clear lacquer. But the white is just so thin.
I was thinking of using a white touch up I had for the roof of a Mini I used to have as a base coat, then using the diamond white over the top as you have suggested.

[disad-vantage-d]

That's what I thought at first, I shook the paint more than thoroughly. But it's consistency is almost like clear lacquer with just a hint of colour. I wondered at first if it was dodgy.

With regard to removing the touch up paint with thinners. I take it this is only when the paint is still wet?

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Thanks for that.
I have a tin of cellulose thinners. I take it that's what you mean?