I have tamiya tape or liquid mask...maybe bare metal foil? the1/48 academy p-47D formation lights are so cooool I tinted them with tamiya clear colors and would not like to botch this up.

Little round lenses? It's easy if you have a punch set. Stick some Tamiya tape to a piece of thin acetate or styrene and punch out the proper sized disc- peel off the tape and you're good to go! Cutting with sharpened brass or aluminum tubing is also an option. Good luck- and cheers!

chuk

Another way of doing it would be to thin the liquid mask with water and then add a drop over the light. Capillary action should allow the mask to flow around the edges and give a clean demarcation.
If the mask overflows then just let it dry, peel it off, and try again.
Hope this helps
Nige

great info, thank you.I will post photos of both Jugs at P-47 heaven when finished.