How to I apply temporary solder mask?

Spot mask can be hand applied, dispensed with a pneumatic system, or stencil printed. To hand apply using a squeeze dispensing bottle: 1) hold the mask bottle upright, but at an angle (around 60°), 2) squeeze the bottle as you drag is across the areas to be masked, 3) for best results, allow mask to fully cure before running through extreme soldering temperature.