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

[thoyer1 at verizon.net]

I've had some success using a plastic straight edge razor blade when working with the lacquer stick and trying to remove the excess.  Followed up by q-tips and a light buff with a microfiber towel.

Tom
W3TA

-----Original Message-----
From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> On Behalf Of Barry
Sent: Tuesday, July 2, 2024 5:25 PM
To: jkharvie <jkharvie at verizon.net>
Cc: R-390 Mailing List <r-390 at mailman.qth.net>
Subject: Re: [R-390] Questions about using a Lacquer-Stik(r)

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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