Paint for polarity marking

[raschemmel]

@groundFungus

As far as I am concerned, that is what White Out was made for. I have never used it on paper.

[mrburnette]

This ESP32 board has red/green/yellow but I also have white/blue/
Been working fine for over 3 years from a $5 investment at the Dollar store.

[TomGeorge]

Hi

@Bjerknez

I often use terminals on my custom perfboards, but i want to paint the terminals to show the polarity (red and black).

I use the green terminals then use red or black marker pen, the colour fixes quite well and is after a month or so just about isopropyl proof.

Tom...
PS. @groundFungus The whiteout solution looks good to, must try it.

[Grumpy_Mike]

Yes me too. Most of the time though I just use it to mark the end of a single or double row of DuPont headers and sockets to make sure they get connected the right way round.

[Bjerknez]

I have now tried acrylic paint and nail polish, and nail polish is an clear winner. Acrylic paint do not cover easy and we must apply several layers.

A nail polish does that job with one sweep.

For now, i think nail polish is the way to go.

[Bjerknez]

Works fine

[MarkT]

@Bjerknez

For now, i think nail polish is the way to go.

Clear nail varnish can be used as a DIY conformal coating...

[Bjerknez]

I know