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.

Help with painting white helmets? - + GENERAL PCA QUESTIONS +

New painter having trouble shading/washing brightly-colored Space

How do you add texture to your bases? - + GENERAL PCA QUESTIONS +

New to weathering - + GENERAL PCA QUESTIONS + - The Bolter and

Vallejo Thinner medium how do I use this? - + GENERAL PCA

Paints going funky - + GENERAL PCA QUESTIONS + - The Bolter and

Help with Bronze - + GENERAL PCA QUESTIONS + - The Bolter and

Vallejo/GW Death Guard Color Conversion (Your Help Needed!) - +

HOW TO USE VALLEJO PRIMERS, HOW TO, AIRBRUSHING

Initial Contrast Experiments (from us all) - + GENERAL PCA

Trying to improve my painting - + WORKS IN PROGRESS + - The Bolter

Help with painting white helmets? - + GENERAL PCA QUESTIONS +

What to use to apply weathering powder - + GENERAL PCA QUESTIONS +

Imperial Fists with Vallejo Game Color / Army Painter Washes - +

Quick Tips: Thinning Paint