The easiest, quickest and cheapest way to protect your pcb is to dip into a Bungard Sur Tin solution. A thin layer of copper will be exchanged with tin. Adhesion and IMC will take place directly on the copper.
Components can be fixed by soldernig or press-fit-connection.

Green Coat is a new spray coating for all PCBs that are manually soldered.

if you use ORIGINAL BUNGARD positive coated PCBs, we have an interesting technical alternative:

We offer the typical green surface finish for printed circuit boards in industrial quality.
Our laminate solder mask is an aqueous alkaline processed dry film mask.