How much resin tint do I need?

Getting ready to do my first resin tint on a longboard, 6 bottom with a fin patch and 6+6 deck.  I am going for a real light blue, and I was planning on adding the tint to the whole gallon of UV lam resin. (I understand that the deck and rails will be darker.)  

About how much tint will I need? and do I need to add any MEKP  for it to kick?

just a few drops. make the batch for the whole board so the color matches. I always add mekp to uv resin. again just a few drops to ensure the whole thing kicks. have fun!