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Old 10-14-2016, 09:54 AM
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Help With Hard-Edged Circle

Does anyone have any suggestions for how to paint a hard-edged circle? When I want a really straight, really hard-edged line, square or oblong shape, I use masking tape to mask out the negative space. How would I accomplish a mask to mask out a circle's negative space? Do you cut a template out, and if so, out of what do you cut the template, and what do you use to affix it to the surface? Are there templates you can buy? Many thanks for your suggestions.
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Old 10-14-2016, 11:08 AM
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Re: Help With Hard-Edged Circle

The British artist Ben Johnson who is noted for his architectural work uses a self adhesive acetate film which he cuts out with a laser. A pair of compasses modified to carry a scalpel blade might be suitable for the cutting out. If the circles are fairly small you could use the sort of self adhesive labels used for computer printing. You might like to consider quilters tape if the circles are larger i.e. greater than 3 inches in diameter. Quilters tape is like masking tape but only 6mm wide. Stretched gently as it is applied removes much of the "wrinkle" on its upper surface which, with normal decorators masking tape, can encourage paint to bleed under the tape. I use quilters tape quite a lot and have never had any problems with it. The main advantage is that it leaves no residue so is unlikely to cause any problems with the surrounding paint.
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Old 10-14-2016, 11:32 AM
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Re: Help With Hard-Edged Circle

Excellent advice already on offer in the previous post.

Me, I have seen templates for various crafts in places like Michaels and Staples, and I think Quilting stores might be worth investigating. With school well underway, there may still be the basic drafting material ~ or for more advanced, college-level courses sometimes still have drafting tools ~ both compasses and templates ~ for certain courses.

Keep an eye peeled during the upcoming gift-giving season regarding the packaging amongst you and yours ~ I've seen very interesting things come out of the packaging for larger electronic things (monitor in my recent case), and the stuff they engineer for keeping packaging weight down while maintaining stability for the item is interesting.

As I recall, glass cutting a jar/wine bottle was once a great craze for crafting ~ so, if one were to cut off near the top and near the bottom, we'd have an open-ended tube? I haven't made glass cuts myself, so maybe I'm over simplifying?

Lastly, the compass idea first put out by Doug in the previous post, perhaps one could attach the paint brush to one of the limbs and scribe the circle first?

Good luck! Cheers
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Old 10-14-2016, 12:38 PM
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Re: Help With Hard-Edged Circle

Are you going to paint your idea on canvas or a flat surface? I would think if you used a sticky template it would work better if the surface was not canvas. You could also buy contact plastic which is used to cover books. It is adhesive and should give a fairly decent template.
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Old 10-14-2016, 01:50 PM
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Re: Help With Hard-Edged Circle

Good ideas from all. Thank you very much. I was thinking this morning that to get a blue circle on a black background, maybe paint the Blue first, and then put a can of stewed tomatoes on top of the blue after it dries, and then paint black around it. That would yield a blue circle. I suppose a drinking glass, jar, or other circular object would work, too.
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Old 10-14-2016, 01:53 PM
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Re: Help With Hard-Edged Circle

Quote:
Originally Posted by Lady Carol
Are you going to paint your idea on canvas or a flat surface? I would think if you used a sticky template it would work better if the surface was not canvas. You could also buy contact plastic which is used to cover books. It is adhesive and should give a fairly decent template.
A gessoed board most likely.
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Old 10-14-2016, 02:13 PM
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Re: Help With Hard-Edged Circle

You might want to consider using automotive detail tape to mask your circle as shown on this site:

http://chromalab.blogspot.com/2009/0...ct-circle.html

To avoid paint seeping under the tape, you can seal the masked edge with acrylic medium.
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Old 10-14-2016, 02:47 PM
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Re: Help With Hard-Edged Circle

Quote:
Originally Posted by Rick G
You might want to consider using automotive detail tape to mask your circle as shown on this site:

http://chromalab.blogspot.com/2009/0...ct-circle.html

To avoid paint seeping under the tape, you can seal the masked edge with acrylic medium.
That is interesting. Thanks.
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Old 10-15-2016, 12:20 PM
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Re: Help With Hard-Edged Circle

A relatively cheap option is clear contact paper. A compass or template my be of assistance with contact paper.
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Old 10-15-2016, 12:56 PM
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Re: Help With Hard-Edged Circle

Quote:
Originally Posted by DMSS
Good ideas from all. Thank you very much. I was thinking this morning that to get a blue circle on a black background, maybe paint the Blue first, and then put a can of stewed tomatoes on top of the blue after it dries, and then paint black around it. That would yield a blue circle. I suppose a drinking glass, jar, or other circular object would work, too.

Thinking outside the circle, good idea!

That might not give you perfect edges though. If you go with making a template cutting out a perfect circle is not easy either. I have begun collecting circle punches which are good for very small circles. There are larger circle cutters too. I do not recommend the Martha Stewart one, it's quite wobbly. That's the one that looks like this: https://i.ytimg.com/vi/42H8dGkeaJc/hqdefault.jpg

That's the only one I have tried. I would search online and check out reviews for better cutters. Maybe the Fiskars one is good.
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Old 10-15-2016, 01:15 PM
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Re: Help With Hard-Edged Circle

I set masking tapes in a glass forming a square, and cut them with a compass exchanging the pencil for a xacto knife then take the pieces and rebuild the circle in the work... is fairly easy and works great...and you have both the external and internal circles for you to mask both ways
And gives perfect circles...
for very small ones I use a circle template for architects.
I'm doing this for my actual painting...


See the tapes are set parallel then I put a pile of small tapes in the center so the tip of the compass stays in the position and cut in the diameter needed. The small ones are made with the green template and the same xacto in the compass... they are perfect circles...

Last edited by fedetony : 10-15-2016 at 01:32 PM.
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Old 10-15-2016, 01:42 PM
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Re: Help With Hard-Edged Circle

Excellent methods, Fedetony. I'm taking notes! Cheers
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Old 10-15-2016, 01:52 PM
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Re: Help With Hard-Edged Circle

Glad to aid the fellow artist... cheers
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Old 10-16-2016, 09:12 AM
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Re: Help With Hard-Edged Circle

Quote:
Originally Posted by fedetony
I set masking tapes in a glass forming a square, and cut them with a compass exchanging the pencil for a xacto knife then take the pieces and rebuild the circle in the work... is fairly easy and works great...and you have both the external and internal circles for you to mask both ways
And gives perfect circles...
for very small ones I use a circle template for architects.
I'm doing this for my actual painting...


See the tapes are set parallel then I put a pile of small tapes in the center so the tip of the compass stays in the position and cut in the diameter needed. The small ones are made with the green template and the same xacto in the compass... they are perfect circles...

Great suggestion. Thank you.
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