[R-390] White lines on knobs

[Larry H]

Thank you Don and Stan,  Using a good etching primer did the trick.  I
used: VHT SP307 High Performance Self-Etch Primer.  It specifically says
for aluminum and it drys very quickly.  Three light coats at 10 min wait
before each and 30 min wait before top coat.  I now have one excellent coat
of black semi-gloss on it.  That should be cured tonight, so we'll see how
the next coat goes.  I have no reason to believe it will wrinkle.  Thanks.

Regards, Larry

On Sat, Aug 17, 2019 at 4:27 AM Don Heywood <wc4g at knology.net> wrote:

> Larry, your "A" model receiver looks very nice, you have been taking your
> time and doing a fine job.
> Now, primer paint. I use a product from Sherwin Williams, it's a self
> etching automotive primer number 988. Works well on both front panels and
> knobs. On the knobs I use two coats with a light sanding in between coats,
> it fills in the mold marks on the knobs which aids in giving me a nice
> smooth top coat. I have used many brands of black, both semi-gloss, flat
> black and appliance epoxy. I have never had any wrinkles form. The
> semi-gloss gives me the most original looking knobs.
> Regards,
> Don WC4G
>
> -----Original Message-----
> From: Larry H
> Sent: Saturday, August 17, 2019 1:03 AM
> To: R-390 Forum
> Subject: Re: [R-390] White lines on knobs
>
> Well, I finally got all of the knobs finished, except for one.  It's being
> a pain getting the black on it without wrinkles.  Tried a couple different
> metal primers to no avail, and they are supposed to be good for aluminum.
> Any suggestions?
>