[R-390] Questions about using a Lacquer-Stik(r)

[jkharvie]

 The Lacquer type variety appears to be a more robust product according to information from the manufacturer.
The MIL Standard 171F has additional information
 https://www.galvanizeit.com/uploads/resources/MIL-STD-171F.pdf 


PAINTSTIK+ LACQUER FILL-IN

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PAINTSTIK+ LACQUER FILL-IN

PAINTSTIK+ LACQUER FILL-IN is a specially formulated solid paint crayon designed to color-brighten stamped or en...
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    On Tuesday, July 2, 2024, 5:24:41 PM EDT, Barry <n4buq at knology.net> wrote:   

 John,

This the one I ordered:

https://www.walmart.com/ip/Markal-Lacquer-stik-White-Fill-in-Paint-for-Engravi/34783848

Apparently it is "long lasting", "stays flexible", "will not rub off", etc., etc.  I'm not sure if I can mimic an engraving in a spare aluminum piece but might try with a thin hack-saw.

Thanks for the reply,
Barry - N4BUQ

> Barry,Given you have a lacquer-stik, i would make some test applications of that
> material  on a piece of aluminum or steel to first hand assess application,
> adhesion, how hard it cures, the time needed, and specific chemical resistance,
> durability etc.I would also indicate if you are going to be using the "putty",
> "crayon', or "paint" type of laquer-stick.I looked up the name and received
> quite a large number of products on the market.Engravers crayon is the only
> type I have applied to my engraved panel that I over achieved with a
> thermally-fused electrostatically applied paint.I am interested in the results.
>   John N3JKE
> 
> Sent from AOL on Android
> 
>  On Tue, Jul 2, 2024 at 10:34, Barry Scott<72volkswagon at gmail.com> wrote:
>  (Trying from the GMail page as the first attempt from my other email
> account was undelivered.)
> 
> I'm going to attempt to use a Lacquer-Stik(r) to fill in the engravings in
> my R390.  I've read where this product takes weeks/months to fully cure.
> Does that sound correct?  I don't mind waiting as I have a lot more stuff
> to do for this radio but would just like to know what I'm getting into.
> 
> I'd also be interested in its durability.  I presume that once it fully
> cures, it's probably fairly tough but I don't know.
> 
> I tried using acrylic craft paint for one small area of engravings.  That
> was a complete failure.  After letting it dry overnight, I literally washed
> it off with soap and water and an old toothbrush!  Not good.  I think model
> car/aircraft paint might work but it might be somewhat difficult to wipe
> clean after application and it could be aggressive on the paint if there's
> much residue.
> 
> For prep, after wet-sanding the front panel down to the bare aluminum and
> scraping out the engravings, I used Rust-Oleum self-etching automotive
> primer followed with two light coats of Rust-Oleum satin enamel.  I let
> that cure in the hot sun for a couple of hours for two or three days in a
> row which seemed to have a good hardening effect and reduced the
> out-gassing quite a bit.  Hopefully that will be durable.
> 
> Thanks for any comments,
> Barry - N4BUQ
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