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.

Vallejo Thinner Medium, 17 ml : Everything Else

Brushing on Citadel Air? - + GENERAL PCA QUESTIONS + - The Bolter

Coloured Metallic Paints - + GENERAL PCA QUESTIONS + - The Bolter

Quick Tips: Thinning Paint

Brushing on Citadel Air? - + GENERAL PCA QUESTIONS + - The Bolter

87199 Acrylicos Vallejo Airbrush Thinner

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

Airbrushing Vallejo Satin Varnish - + GENERAL PCA QUESTIONS +

Anyone know if there's any pearlescent paint out there? - +

Lahmian Medium and Iron Hands - + GENERAL PCA QUESTIONS + - The

Leadbelcher Spray Acting Oddly with Shades? - + GENERAL PCA

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

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

New painter having trouble shading/washing brightly-colored Space

Glaze or Inks Over Metallic Zenithal Primed Models - + GENERAL PCA