Solder mask does not allow the solder to stick to it. It is why you can solder to a solder pad, but not to the board itself. It does not conduct electricity.
LY-UVH900 is used to:
Insulate jumpers.
Cover exposed ground around BGA chipset pads.
Cover leads of components you do not want to touch a jumper.
It is heat resistant. Apply a small amount using a toothpick, then cure in with UV light. We also sell a UV “nail salon” style light to cure the green oil mask.
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