[R-390] EXT: Re: Painting Knobs

Sat Aug 17 16:27:45 EDT 2024

I’ve done this a few times and it works well for me.

I’ve had all the knobs glass bead blasted to strip them and provide a bit of “tooth” for the paint to adhere.

I have sprayed all knobs with Tempo brand marine Zinc Chromate primer.

Available at most boat dealers service shops.

I let that cure naturally for a couple weeks.  You will know when it’s cured as it will develop a feel that it’s no longer still drying.  A slick feel that indicates it cured.

 I then spray with my satin topcoat…Krylon or Rustoleum…your choice.

I let that cure for a couple weeks and you are good to go.

Very durable finish.

Cecil

Sent from my iPad

> On Aug 17, 2024, at 2:37 PM, Fisch, Michael <mfisch at kent.edu> wrote:
> 
> Hi,
> I had an old can of zinc primer I used when I redid my 390a 15 yeras ago.  It is by TEMPO and it was a marine paint, but they have others.
> Search tempo primer.  Or is it a different primer?
> 
> Michael Fisch
> AC8PD
> ________________________________
> From: r-390-bounces at mailman.qth.net <r-390-bounces at mailman.qth.net> on behalf of Jordan Arndt <Outposter30 at shaw.ca>
> Sent: Friday, August 16, 2024 4:53 PM
> To: Les Locklear <leslocklear at hotmail.com>; Jacques Fortin <jacques.f at videotron.ca>; 'Barry' <n4buq at knology.net>
> Cc: 'R-390 Mailing List' <r-390 at mailman.qth.net>
> Subject: EXT: Re: [R-390] Painting Knobs
> 
> Thanks for those posts guys...I thought I remembered that at least some of
> the knobs I had done in years gone by had yellow primer. It's whats on the
> inside of of the  frequency dial cover. IIRC...
> 
> FWIW, I had good luck with heating the knobs to ~300F before applying the
> primer, then checking for coverage voids and then baking the primer on at
> 300F for 30 minutes, then repeat for the color coat. I believe I used an
> automotive primer for zinc plated parts.
> 
> 73...Jordan VE6ZT
> 
> 
> ----- Original Message -----
> From: "Les Locklear" <leslocklear at hotmail.com>
> To: "Jacques Fortin" <jacques.f at videotron.ca>; "'Barry'" <n4buq at knology.net>
> Cc: "'R-390 Mailing List'" <r-390 at mailman.qth.net>
> Sent: Friday, August 16, 2024 1:36 PM
> Subject: Re: [R-390] Painting Knobs
> 
> 
> Like a lot of things, it has probably been banned. Many years ago, when I
> was a service manager for an automotive dealership we used it to combat
> corrosion problems on battery terminal posts. Clean them, spray with zinc
> chromate primer…end of problem. Most of the R-390’s I’ve seen have yellow
> ( zinc chromate primer) as a base for painted parts. The batteries these
> days don’t seem to have the same problems. Hey, I’m old this was over 50
> years ago in the early 70’s. I still have a rattle can of it. Does it work?
> I don’t have a clue or an R-390 series receiver anymore. I just read for
> memories from old friends.
> 
> Les Locklear
> 
> Sent from my iPad
> ________________________________
> From: Jacques Fortin <jacques.f at videotron.ca>
> Sent: Friday, August 16, 2024 2:25:23 PM
> To: 'Les Locklear' <leslocklear at hotmail.com>; 'Barry' <n4buq at knology.net>
> Cc: 'R-390 Mailing List' <r-390 at mailman.qth.net>
> Subject: RE: [R-390] Painting Knobs
> 
> Yep, it was the name of the yellow stuff that can be found years ago.
> Does not seems to be available anymore on this side of the border however...
> 
> 73, Jacques, VE2JFE in Montreal
> 
> Zinc Chromate Primer. It's available in rattle cans.
> Les Locklear
> 
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