Spray shield paint aka graphite

[Gregg]

Dry graphite in a spray can should be readily available.  Try https://www.amazon.com/CRC-Graphite-Lube-Aerosol-Black/dp/B007I9XUD0/ref=pd_lpo_263_t_0/147-5277979-5868239 an d as always, Amazon will show a multitude of related and mostly unrelated items.
Here is more information on graphite suitable for coating: https://streettechmag.com/2015/06/18/ten-shades-of-gray-ten-uses-for-spray-graphite-lubrication-and-how-it-works/

[Quarlo Klobrigney]

Slip Plate is a temporary bond and will not adhere permanently.
The eBay guy has to show the same 5 pictures of a bottle of "military grade" goo. Not at all inspiring confidence. Besides it's a brush on where it wastes the product.

Still no sources in the US of what can be found in the EU quite readily.
But keep the suggestions coming.


I found out the "gitar" guys' secret formula. Carbon Black in suspension......in water.
I guess I have to find out what the conductivity of Kingsford charcoal briquettes are.
Grind them up, and dump it in some water and a binder such as corn starch, and spray it with my gun.
I don't barbecue, anybody have a charcoal lump they would like to put an ohm meter to?

[Alex Eisenhut]

Fair enough, you do need more than water... Attached is my stuff.

https://www.ebay.ca/itm/CONDUCTIVE-GRAPHITE-SHIELD-SHIELDING-PAINT-REDUCES-GUITAR-HUM-BUZZ/171335822312?hash=item27e4692be8:g:PNQAAOxykUZTexs~

I'd look into little airbrush kit with the canned air and see if that would work. IDK... 

[madires]

... or get a can of clear acrylic lacquer and some graphite powder (for example: graphite lubricant). Mix the graphite into the lacquer and be happy.

[Quarlo Klobrigney]

Ahhh lacquer.... That's a whole nother can that needs not opening. You see it's still quite humid here and..... anyone who knows what happens in humidity and lacquer. This fall will make my third attempt when the weather calms down to spray a cabinet. This time for sure. I've had plenty of time to sand it again...

Quote from: madires on Yesterday at 18:20:56

... or get a can of clear acrylic lacquer and some graphite powder (for example: graphite lubricant). Mix the graphite into the lacquer and be happy.

[Quarlo Klobrigney]

I have a busy and have a messy workbench. When I finished a very large footprint repair item it was time for cleanup as I do after every project completion.
That's when I discovered my 2" wide roll of copper tape I ordered some time ago.
I was going to use it to build shielded capacitors as required to replace the original German types in may of the repairs that I do.
Not suitable for what I was asking about earlier, but I forgot about my FY6900 and the garbage that the SMPS spews forth even in the standby mode.
I have to hit the main power switch just to listen to the AM BC and SW bands because it is so noisy.
So I opened it up and did the following:

[Quarlo Klobrigney]

The garbage level went down to almost an imperceptible level.
I use the unit to do RF alignments and the level had to be turned up to 2V just to perform the alignment.
I bonded the individual pieces of tape with solder blobs and bond wires.
Be careful not to let the copper tape get too high on the plastic mount pieces.
Burnish all the tape down.
Don't let it creep up on the mounting posts.
Do cut short ALL PC board leads to keep anything from shorting out.

If I had the magic woo shield spray that costs so much, I could have done a better job, but this method works just fine.

I'll put a fan in it as soon as I find my 12+ full box of new fans that is somewhere...I don't know where. All hiding since the move a few years ago.

[Alex Eisenhut]

The good thing about copper foil is a pretty good shelf life, maybe decades. The conductive paint eventually dries out.

[Quarlo Klobrigney]

It'll probably hold up longer than the Feeltech!

[amspire]

Black Acrylic artist ink is conductive.

I wouldn't think so, having measured a few different.

Are you sure you aren't measuring it while still wet/moist? They are water-based and seem a bit "conductive" for many hours until the solvent (water) completely evaporates.

You can mix fine graphite powder in acrylic paint/ink however, this is what I have successfully tried for through hole activation before electroplating. It needs to be very fine powder, though.

I had dried my test patch in an oven, so it was pretty dry. Just tested it 4 days later and it has gone down from 8K to 6.6K.

Sure you are not thinking of acrylic paint? People use black acrylic ink for making DIY plated through holes on PCBs.

[Siwastaja]

I had dried my test patch in an oven, so it was pretty dry. Just tested it 4 days later and it has gone down from 8K to 6.6K.

Sure you are not thinking of acrylic paint? People use black acrylic ink for making DIY plated through holes on PCBs.

Well, obviously it depends on if the pigment used is conductive or not. I would expect carbon black to be conductive. If the label doesn't say, then it needs to be tested.

I did the hole activation for through-hole plating first using my own mixture of conductive ink, then moved to the conductive ink by Think&Tinker Ltd, https://www.thinktink.com/stack/volumes/voli/store/inksup.htm , which worked better, finally achieving an acceptable yield (typically no defective or iffy vias in a PCB of about 200 vias). This is freaking expensive, though.

[amspire]

I had dried my test patch in an oven, so it was pretty dry. Just tested it 4 days later and it has gone down from 8K to 6.6K.

Sure you are not thinking of acrylic paint? People use black acrylic ink for making DIY plated through holes on PCBs.

Well, obviously it depends on if the pigment used is conductive or not. I would expect carbon black to be conductive. If the label doesn't say, then it needs to be tested.

I did the hole activation for through-hole plating first using my own mixture of conductive ink, then moved to the conductive ink by Think&Tinker Ltd, https://www.thinktink.com/stack/volumes/voli/store/inksup.htm , which worked better, finally achieving an acceptable yield (typically no defective or iffy vias in a PCB of about 200 vias). This is freaking expensive, though.

This the brand I am using. Colour is No 028 Black.

https://www.daler-rowney.com/fw-acrylic-ink/

The instructions say to shake it which I didn't do, so I probably could have got a lower resistance.

[Alex Eisenhut]

It'll probably hold up longer than the Feeltech!

LOL certainly longer than mine. I got  the Feeltech function generator, it worked for about a week, then it died!