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Clean the area that you want filled with 98% Isopropyl Alcohol. let dry.
- Pick finger nail polish color you want to fill lettering with and basically paint over the letters not worrying if you get out of the letters. I basically painted a box around the letters making sure the paint filled all the letters.
- Let paint totally dry
- take cotton pads, (not soaked) with NON-ACETONE finger nail polish remover and slowly glide it over the painted area gently.
- Basically you will remove the nail polish on the surface area but the polish that went into the engraved lettering will remain. Remember to wipe with a slight touch. do not press down to hard.
- once you are done get a towel with Rem oil (or other gun oil) and give a god rubbing to get the luster back

- Nail polish
- 98 Isopropyl Alcohol
- non-acetone finger nail polish remover
- cotton pads, or q-tips

if i did this correct. Stole the idea from several on the S&W forums.
Before



after

did both sides.