Vallejo Thinner medium how do I use this? - + GENERAL PCA QUESTIONS + - The Bolter and Chainsword

I've never used a thinner before. Last night I picked up Vallejo medium thinner. I've known for a while my results would look better if I thinned my GW paints a little . So how do I use this? Thanks.

How to use Vallejo Paint and Thinners • Canada's largest selection

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