[R-390] White lines on knobs

[John Gedde]

Spray them black, let then dry for several hours or overnight then they can be baked for 1 hour at 150F followed by another hour at 200F.  It will smell but it's not all that bad if the paint is dry beforehand.  Open the windows and you'll be fine.  Don't try to paint them as a batch.  Put them one by one on a dowel held in your hand so you can move them around for spraying.  Then insert the dowel and knob into a block of wood with holes drilled in it.  When you're done, you'll have a block of wood with a bunch of dowels sticking out, each with a knob on it.  When I oven baked my sets, i just put the wood block with all the knobs in the oven.  200F is not hot enough to affect the wood.Photos when you're done?JohnSent via the Samsung Galaxy S8 Active, an AT&T 5G Evolution capable smartphone
-------- Original message --------From: Larry H <larry41gm at gmail.com> Date: 7/24/19  8:10 AM  (GMT-05:00) To: John Gedde <jgedde at optonline.net> Cc: R-390 Forum <r-390 at mailman.qth.net> Subject: Re: [R-390] White lines on knobs Thank you John, for the very good info.  Can the knobs be put into the oven right away?  About how long should they be baked?Regards, LarryOn Wed, Jul 24, 2019 at 4:42 AM John Gedde <jgedde at optonline.net> wrote:HI Larry, It took a  bit of experimentation to get it right.  Both with paint and application.  For paint I settled on acrylic model paint from Vallejo called “Model Color” that I picked up at my local hobby shop.  I used color “Ivory.”  It has good body. Application was a bit trickier.  I settled on using a hypodermic style syringe with interchangeable tips.  I used a really fine tip.  It was fine enough that the paint came out slowly enough to control, but was also sufficiently fine that I kept having to replace tips since they clogged after a few knobs.  They were either the sky blue or blue colored tips.  https://jensenglobal.com/pages/standard-dispensing-tips#it-series-standard The a quick swipe with a dry finger to smooth it out and remove the excess.  A little rubbing alcohol on a tissue can be used to get rid of any smears as long as the knobs were painted with good paint (Krylon is not alcohol resistant).  It’s important if the rubbing alcohol is to be used that the black paint on the knobs is fully cured else just about any rattle can paint comes off.  If the knobs still smell like paint, they’re not yet cured.  An oven bake at 200F cures the black paint quickly.  I used Rustoleum black gloss for my R390A and VHT stain black engine enamel for my R390. John   From: Larry H <larry41gm at gmail.com> Sent: Tuesday, July 23, 2019 9:23 PMTo: jgedde at optonline.netCc: R-390 Forum <r-390 at mailman.qth.net>Subject: Re: [R-390] White lines on knobs John,  As I mentioned to you a short time ago, I'm redoing all the black on the 'A' I'm working on now and have come to the point where I need to apply the white lines on the knobs.  I like how yours turned out and this has been a problem for me in the past, so I was wondering what paint you used and your method of application.  Thanks. Regards, Larry