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  • April 27, 2017 at seven:48 am #995057

    Does anyone accept feel with rabbit skin gum. I'm starting a new painting and I'm using rabbit pare gum instead of gesso.

    JWB - Forgive the by, accept the nowadays, welcome the future and never look back.
    http://johnsartark.com

    April 27, 2017 at 7:55 am #1268764

    Hello,

    The following is just a copy and paste from wikipedia. However, the information looks accurate, I have seen bits of this data scattered in literature:

    Rabbit-Peel Mucilage:

    When used in painting as a sizing, it is spread thoroughly over a sail that has been placed on the stretcher. When the glue dries, it tightens the canvas. After this has been allowed to dry, an oil-based primer is then applied. A canvas sized with rabbit-skin glue can exist fabricated tighter than with other alternatives—such as an acrylic-based gesso—because of the shrinkage. This type of canvass is besides valuable considering it can exist sanded to a flatter texture, which allows the painter to attain a finer level of item than can be achieved with a typical acrylic gesso ground.

    This rabbit-skin glue ground is only appropriate for use under oil paint. Acrylic-based media volition flake off a canvas prepared with rabbit-skin mucilage and are therefore not appropriate.

    Rabbit peel glue is considered to be a major cause of cracking in oil paintings by most mod conservators. Because the mucilage is hygroscopic, it continually absorbs moisture from the temper, causing the glue to swell and shrink equally ambient humidity levels change. Over many humidity cycles, this repeated flexing causes the brittle oil paint to crack. Modern substitutes for rabbit skin glue are available, such as Gamblin's PVA size and Gold Acrylics' GAC100. These substitutes practise not have the hygroscopic properties of rabbit pare gum, while still being very slightly hygroscopic, and should not crusade the damage to oil paints that rabbit pare mucilage does. However, these modern replacements do not stiffen and tighten the canvas likewise as rabbit skin glue does, so some artists still prefer to use rabbit pare mucilage.

    Apr 27, 2017 at 8:08 am #1268773

    Thanks for the info. I've applied 2 coats to the canvas and the finish texture is much better than what I become with gesso. I'm only working in oils. Idea I would give it a shot. I similar pushing the envelop any little scrap.

    JWB - Forgive the past, accept the present, welcome the time to come and never look dorsum.
    http://johnsartark.com

    Apr 27, 2017 at 5:23 pm #1268765

    I'yard using rabbit skin glue instead of gesso.

    John, do you empathise that the intention of RSG is as a buffer between the canvas and the gesso? Its not a replacement for gesso. The RSG protects and stiffens the canvas. The gesso fills the weave a bit, and provides an even and semi-permeable ground for the oil paint.

    I have heard of painters painting directly onto a RSG primed canvas (if y'all search the forums, you may find more all-encompassing conversations) because they desire to retain the natural look of the canvas. I don't think in that location's an archival trouble, except that RSG is reputed to cause cracking over the long term. Only the paint handling might be more than difficult. If you lot don't mind that, full steam ahead :)

    :::

    April 27, 2017 at 6:27 pm #1268774

    Jeffro,
    Thanks for the input. I've applied ii coats of RSG with a coat of oil on superlative of that. In one case this dries I will sand with a fine sandpaper. At this point I will determine if it'southward ok to paint on. I capeesh your input.

    Thanks,

    JWB - Forgive the by, accept the present, welcome the future and never look back.
    http://johnsartark.com

    April 27, 2017 at 11:52 pm #1268756

    Anonymous

    Stop at present and drib the sandpaper, RSG is a size or sealer non a basis like gesso, as mentioned, and y'all don't sand a size, sanding RSG will simply defeat it's purpose and quickly expose the raw canvas surface fibers to your oil paint.

    Apr 28, 2017 at eight:48 am #1268754

    First, I want to indicate out that RSG is a barrier between linen and the linseed oil contained in oil paint; paradoxically, linseed oil and linen come up from the same plant, just they are incompatible as the oxidation of linseed oil damages linen! So an RSG barrier is introduced between linen and oil gesso. RSG is not needed if you employ acrylic gesso.
    John, I am not sure what you meant when you wrote, "I've applied 2 coats of RSG with a coat of oil on top of that." What exercise you mean, oil:
    A coat of linseed oil? A coat of oil paint? a coat of oil base gesso?
    Sanding is used between coats of gesso. Generally more than ane coat of gesso is applied, sometimes as may as ten to achieve a smooth surface. I think Sid misread your post, but nonetheless, you accomplish cipher past sanding ane coat of oil, whatever it was. Please clarify….
    BTW, in that location is a clear acrylic gesso on the market if yous love the appearance of raw linen showing. I have seen it used and the linen shows through beautifully, specially dark Belgian linen!

    April 28, 2017 at 2:45 pm #1268775

    Thanks for the input. I've never used RSG before. As per your recommendation I did not sand information technology. I'grand applying a simple semi-gloss oil base of operations enamel on superlative. I've used the semi-gloss enamel before and had good results. The project paintings I'1000 working on at present are all 48″ x 48″ so it takes a footling time to prepare the canvas.

    Appreciate the input,

    JWB - Forgive the past, accept the present, welcome the future and never look back.
    http://johnsartark.com

    Apr 28, 2017 at 8:34 pm #1268757

    Bearding

    I think Sid misread your mail service,

    no, I didn't misread his post, he clearly said that he applied oil over the RSG treated canvas (I presume it is raw canvas),

    I've practical 2 coats of RSG with a coat of oil on summit of that

    .
    and like RSG, no type of oil is a ground.
    Sandpaper will chop-chop and very easily remove it along with the RSG and expose some of the raw canvas fibers.
    In order to resume a previous painting and tweak it, today I lightly steel wooled an 8 twelvemonth one-time painting with extra fine OOOO steel wool and information technology chop-chop removed foliage that was an average coating of oil pigment, which does contain solids.
    Dandy oil is fifty-fifty more fragile and would provide no protection from an abrasive sandpaper.
    You tin employ either 1 or ii coats of RSG to raw canvas, if you want to apply two coats, yous tin can very lightly sand the showtime coat to make information technology smoother, but you lot should not sand the 2d glaze or 1 single coat.

    Apr 29, 2017 at five:04 am #1268772

    The barbaric handling of Rabbits especially has been in the news all over the world recently. Mainland china and other countries have long been suppliers of Rabbit skin and fur. It is under investigation.

    Please stop using Rabbit skin. Using mod alternatives justified.

    April 29, 2017 at 5:25 am #1268766

    The stories of cruel treatment in the Chinese fur industry are very agonizing.
    Only surely RSG is a byproduct of legitimate rabbit meat farming? Legal rabbit meat farms in Australia (and I promise elsewhere) are discipline to constabulary and the scrutiny of authorities officials, so hopefully the creatures are treated humanely.

    :::

    I use it for priming of wooden panels sometimes. This recipe of ground preparation works really well for me. After finishing with mucilage and chalk I wait a few days, then make an underdrawing with bone blackness ground in egg tempera. Then I apply a layer of oil-rich pb white paint and let it dry well – it serves as a skilful intermediate layer betwixt all the residual oil paint layers and the chalk ground.

    Hi Roman,
    I've never used RSG before. I got the idea from Artists magazine. I used it on my nearly recent painting. I covered it with Murpheys Soap Oil and then practical 2 coats of semi-gloss enamel house pigment. Then far I'thou very happy with the finished surface.

    JWB - Forgive the past, accept the present, welcome the future and never look back.
    http://johnsartark.com

    Delight stop using Rabbit pare. Using mod alternatives justified.

    Acrylic solvent borne spray pigment or varnish as a base size for acrylic primer.

    May sixteen, 2017 at 10:21 am #1268758

    I really did a lot of inquiry on this recently, and hate to tell you this but RSG isn't recommended for employ on canvas or any other flexible surface. Information technology'south hygroscopic, meaning it absorbs moisture over time. This tin cause the glue to expand and contract, and thus crevice fully dried paint. Hither is some helpful data. Note the Smithsonian'southward inquiry on this, although it'southward a chip more taxing to read.

    https://www.gamblincolors.com/oil-painting/sizes-and-grounds

    https://www.si.edu/mci/downloads/reports/Mecklenburg-Part1-RH.pdf

    RSG is supposed to be safer for apply on panels and such, equally it was originally used when egg tempera painting was pop. Acrylic gesso (which isn't a truthful gesso from what I've read) is more than appropriate for canvas since information technology has requite.

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