'Canvas' stretching

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Parm
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'Canvas' stretching

Post by Parm » Sat 25 Jan, 2020 4:47 pm

Hi all. A customer has bought in a canvas for stretching. Its not really a canvas though more like a bed sheet - really thin cloth. The painting on it is in acrylic and in places really thick. It measures 1m sq. I advised the customer that stretching may possibly tear it, and that any cracks in the acrylic would open up and be more visible. She's happy for me to proceed. Would it be better to try to tack it onto board rather than stretcher bars OR any other suggestions? Thanks in advance :)

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Re: 'Canvas' stretching

Post by fusionframer » Sat 25 Jan, 2020 5:42 pm

If material more like a bedsheet, perhaps sewing it around a board as you would a tapestry. That would give it a good even tension and there would be less risk of paint cracking.

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Re: 'Canvas' stretching

Post by JonathanB » Sat 25 Jan, 2020 7:21 pm

Parm - I think Nick's suggestion of treating it like a piece of needlework is a good one. Assuming the rebate of the frame you're planning to use will accommodate it, you might consider using 10mm foam board as a useful support. It doesn't readily bend, is very strong and supportive and will allow you to pin the work out and test the strength of it as you go, without using stretcher bars and putting the work under unnecessary strain. I've used this approach successfully with very flimsy batiks which are not of great value but need to be treated with care. Good luck.
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Re: 'Canvas' stretching

Post by YPF » Sat 25 Jan, 2020 7:51 pm

With these things I tend to advise sticking them down, if at all possible with a HotPress or Jetmounter but the method depends on the quality of the “canvas” and thickness of the paint. As a last resort I have used wet glue onto a board and plenty of weights.

If these options are not available I have put on stretcher bars - very carefully with extra fabric to prevent staples going straight through or, as already mentioned, lace onto a board as a cross stitch etc.
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Re: 'Canvas' stretching

Post by prospero » Sun 26 Jan, 2020 12:36 pm

I've had a few of these. I would make a rigid frame from 'stretcher' moulding and face it with 5mm foamcore.
Then staple the material around the edge in the manner of a canvas. It's important not to impart too much tension.
The aim is to get it flat with no waves, but not 'drum tight'. The foamcore will support it and also make it brighter
if there are semi-transparent sections. The staples need to be fairly close or you may get scolloping on the edge.
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Re: 'Canvas' stretching

Post by Not your average framer » Sun 26 Jan, 2020 3:19 pm

I had quite a few on these brought in the customer brought them back from African and they were far from flat when the came. II stretched them on to stretcher profile pine mouldings. They were mostly rather large and were supplier tightly rolled. they were not fun to do. I was under the impression that the paint was made using local earth pigment and PVA glue. PVA glue is somethings used as a dry mounding adhesive and when set it can be easily re-melted in a hot press. I would urge caution about dry mounting anything that contains PVA based paint, as the paint may melt during the dry mounting process in the hot press. Maybe, better safe than sorry.
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Re: 'Canvas' stretching

Post by Steve N » Mon 27 Jan, 2020 7:46 am

YPF wrote:
Sat 25 Jan, 2020 7:51 pm
With these things I tend to advise sticking them down, if at all possible with a HotPress or Jetmounter but the method depends on the quality of the “canvas” and thickness of the paint. As a last resort I have used wet glue onto a board and plenty of weights.
Tend to be my chosen method as well, they tend to come from Africa, with no real value, just a memory :sweating:
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Re: 'Canvas' stretching

Post by YPF » Mon 27 Jan, 2020 8:34 am

Customer: Can you frame this oil painting on a canvas that I bought whilst on holiday?

Me: What you have actually bought is an emulsion or acrylic on a very low thread count bedsheet. (Said with the utmost tact and diplomacy :wink:)
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Re: 'Canvas' stretching

Post by YPF » Mon 27 Jan, 2020 8:40 am

Not your average framer wrote:
Sun 26 Jan, 2020 3:19 pm
I would urge caution about dry mounting anything that contains PVA based paint, as the paint may melt during the dry mounting process in the hot press.
Mark,

I’m sure you appreciate it’s knowing your tools and how to use them. The HotPress has a temperature control and can also be used cold - so just using the very effective vacuum element. Rest assured, we are very careful with our customer’s artwork.
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Re: 'Canvas' stretching

Post by Steve N » Mon 27 Jan, 2020 9:17 am

YPF wrote:
Mon 27 Jan, 2020 8:34 am
Customer: Can you frame this oil painting on a canvas that I bought whilst on holiday?

Me: What you have actually bought is an emulsion or acrylic on a very low thread count bedsheet. (Said with the utmost tact and diplomacy :wink:)
:giggle: :giggle: :rock:
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Parm
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Re: 'Canvas' stretching

Post by Parm » Mon 27 Jan, 2020 11:11 am

Good morning ! Your absolutely right, it is from Africa - purchased from a market stall. Its far to big for my Jet Mounter, so I think I will try Prosperos technique. Fingers crossed... Thank you all so very much

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