Painting on CNC routed signs bleeding into grain - Router Forums
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post #1 of 17 (permalink) Old 04-07-2019, 07:18 PM Thread Starter
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Default Painting on CNC routed signs bleeding into grain

I've been doing like everyone does. using spray paint to paint the routed sections then sanding off the paint to only leave the routed areas painted. But I've been noticing the paint bleeding into the grain. I've even painted the wood with sanding primer prior to painting but that didnt seem to make much of a difference.

Does anyone have any tips on ways to keep the paint from bleeding?

Will it be better to paint with a brush?

Does using an airbrush make any difference? I've heard that the atomized paint makes sanding easier.

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post #2 of 17 (permalink) Old 04-07-2019, 07:51 PM
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What kind of wood and paint, Gary? I have sealed bare wood areas with Nitrocellulose sanding sealer or Shellac and then painted with no real issues. I've used both brush and spray (rattle can). I've used my air brush for small areas but usually seal them first.

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post #3 of 17 (permalink) Old 04-07-2019, 08:33 PM Thread Starter
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David wood is all over the place, anything from rough cut, air dried pine, hemlock, white oak & maple to kiln dried pine, oak, cherry & maple.

How many coats of sanding primer do you use when you applying it?

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post #4 of 17 (permalink) Old 04-07-2019, 10:13 PM
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Not sanding primer, Nitrocellulose sanding sealer - clear, like I use on a clear lacquer finish. One will do it, or has. I suppose you could do two to make sure since it doesn't take long to dry.

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post #5 of 17 (permalink) Old 04-07-2019, 10:30 PM
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Quote:
Originally Posted by Gary Wiant View Post
I've been doing like everyone does. using spray paint to paint the routed sections then sanding off the paint to only leave the routed areas painted.
No, not every one. The few times I paint anything I use a brush, acrylic latex, and have never had any bleeding issues.

"It ain't what you're told, it's what you know." - Granny Weatherwax
Gather the villagers, pitchforks, torches; we march at dusk!
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.....Call me a craftsman, artisan, or artistic, and I will accept that. Call me an artist and you will likely get a quite rude comment in return. I am not a @#$%ing artist.
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post #6 of 17 (permalink) Old 04-07-2019, 10:49 PM
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Gary,

On big projects like this one (37" across) I just brushed over the text with Zinser shellac and used acrylic paint, sanded, and stained.

On the smaller signs I use mask and acrylic paint - brushed on. Acrylic paint doesn't bleed much and sands right off. I've found that brushing instead of spraying, although more time consuming, leaves less to clean up, and looks better, especially in wood with rough grain. I've tried the Marsh Ink - but I think it looks like sprayed on ink.

Just my opinion. But I'm not paying anyone either, so time doesn't mean as much.
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post #7 of 17 (permalink) Old 04-07-2019, 11:03 PM Thread Starter
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Joat - your right not everyone but, but you are still basically doing the same thing. Paint it on & sand it off.

David & John I'll post a photo of what I've been using it may be sanding sealer & not sanding primer

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post #8 of 17 (permalink) Old 04-08-2019, 07:37 AM
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This is about the only photo I have that shows something where I used Nitrocellulose sanding sealer and then brushed the letters and sprayed the apple. I don't see any bleeding in the photo and don't recall any when I did this.

Painting on CNC routed signs bleeding into grain-001-apple-name-sign.jpg

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post #9 of 17 (permalink) Old 04-08-2019, 10:02 AM
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As has been said, shellac is a perfect sealer, I wouldn't be without it.

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post #10 of 17 (permalink) Old 04-08-2019, 11:03 AM
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Quote:
Originally Posted by Gary Wiant View Post
Joat - your right not everyone but, but you are still basically doing the same thing. Paint it on & sand it off.
Nope, I do my sanding before painting, not after, just paint very carefully.

"It ain't what you're told, it's what you know." - Granny Weatherwax
Gather the villagers, pitchforks, torches; we march at dusk!
Some days, the supply of available curse words is insufficient to meet my demands.
.....Call me a craftsman, artisan, or artistic, and I will accept that. Call me an artist and you will likely get a quite rude comment in return. I am not a @#$%ing artist.

Last edited by JOAT; 04-08-2019 at 11:06 AM.
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