'The Tools of Contemporary Masters'Since 1980, Gamblin has handcrafted luscious oil colors and contemporary painting mediums that are true to historic working properties, yet safer and more permanent. All of Gamblin's oil painting materials are handcrafted at the company's wind-powered factory in Portland, Oregon. These are art materials you can trust for permanence and studio safety — from the industry leader.Rabbit skin glue is the traditional size for fabric support on panels. It seals porous fabric and isolates it from ground or oil paints.Stretching the canvas is easy, because the size shrinks as it dries. It is mixed with water to make a strong adhesive. However, atmospheric changes may result in movement, causing aged oil paintings to crack.
Glue For Canvas Repair
By on April 13, 2016 in,GAC 400 is used to stiffen fabric or paper made from natural fibers. It is a water-borne acrylic that dries to a hard, stiff film. One good coat that soaks in well should be enough to stiffen the material.
It can be used to replace rabbit skin glue for stiffening linen and canvas in preparation for oil painting. If you would like to build larger scaled, free-standing structures, it will need the help of an internal or external rigid structure.GAC 400 should soak into the fibers of the fabric or paper so it is functioning throughout the material. It should not be applied thickly and will function best if not diluted. Depending on your specific application, you may opt to heat-set GAC 400 to decrease water sensitivity, and increase the stiffening properties to some degree.Care should be taken not to roll, stretch or bend any fabric or paper stiffened with GAC 400 as micro cracks will form that will eventually decrease the stiffness of the material. One ounce of GAC 400 should cover about 1 square foot.
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The soaking method will use more product.Two Most Common Uses for GAC 4001. Fabric, Textile and Paper Stiffening ApplicationsBrush apply GAC 400 to the paper or fabric liberally, allowing it to soak into the material. Thicker natural fabrics like cotton canvas work best. Excess product sitting unevenly is fine, as it will become translucent and much less visible when dry. Expect some gloss on the surface and a slight darkening of the fabric. For even more stiffness, you can soak the fabric or paper in GAC 400 that has been poured into a shallow container. Wipe off the excess and drape or position for drying.
Again, you do not need to be so concerned about removing all the excess medium. Latex or vinyl gloves are recommended for this technique. Dried and stiffened canvas.Polyethylene plastic sheeting works well as a non-stick surface for the wet fabric pieces and you should be able to peel the fabric off when dry, but paper may be more of a challenge as it can tear easily if stuck to the plastic. Some heavier weight papers may work better. It is always best to use acid free paper for any fine art application.For sculptural uses, GAC 400 is best used on small scale paper or fabric pieces, as it may be difficult for heavy or very large objects to retain their shape. It can be helpful to drape the wet material over a form to keep its shape as it dries, but the form should be made of HDPE plastic or covered with polyethylene plastic sheeting to prevent sticking. Smaller pieces of fabric can be stiffened and assembled by gluing the pieces together in an architectural fashion, using thicker Gel Mediums like our High Solid Gels.
Think post and lintel construction. This method works quite well as you can see in the photo.
It will still be a somewhat delicate structure and should be handled carefully. Bas relief paper collage made with thin notebook paper stiffened with GAC 400.Various types of bas relief paper collage can be done using GAC 400 soaked paper adhered to an appropriate substrate and manipulated to create raised and textured surfaces. Rigid panels are best. The paper or fabric can be painted once dry.2. Rabbit Skin Glue ReplacementMaterials like Rabbit Skin Glue are extremely hygroscopic, which means literally ‘water loving’, and will respond rapidly to changes in relative humidity, dramatically tightening and growing slack in the process. As a safer alternative, GAC 400 can be used as a size on canvas or linen, stiffening them in a similar way as rabbit skin glue, but without the same amount of sensitivity to humidity. This allows it to retain its stiffness over a much wider range of ambient conditions, although it remains vulnerable to prolonged contact with water.
To lessen that sensitivity, please see the following section on Heat Setting.Please note, unlike Rabbit Skin Glue, GAC 400 will not block oil penetration so additional steps are needed before painting with oils. Please see the following for our recommendations:Preparing a Canvas for Oil Painting:Here is a link to descriptions of our special purpose mediums, including GAC 400:Special Purpose Mediums:Heat-Setting Option and Recommendations:While GAC 400 is rarely heat-set, and will work to stiffen materials without it, heat-setting does provide some benefits such as much less water sensitivity and some increase in stiffness. If heat-setting is not done, pieces with GAC 400 should not have prolonged contact with water, nor ever be immersed, as the medium could soften or possibly liquefy.To heat-set, allow GAC 400 to dry overnight. Using a hair dryer set on high, heat-set GAC 400 for 5 or 10 minutes. This heat-setting is based on temperature and duration; the hotter the setting, the faster the process will be. Do not scorch the surface. The temperatures in hair driers can vary greatly so it is best to select one which seems to offer the hottest settings.Please note that heat-setting GAC 400 releases trace amounts of formaldehyde, which may be of concern to those with chemical sensitivities. We recommend providing fresh-air ventilation when using heat-set products.
Tina, not sure the total properties of Paverpol but it appears to be a vinylacetate polymer. Not sure of the other constituents, but possibly including some type of plaster as well? Just a guess based on the uses and drying times. The GAC 400 is an acrylic polymer that was originally developed for the textile industry to create additional hardness to polyesters. It is not a great film former, but an excellent hardener, especially if heat set. The drying time is similar to other acrylics. Hope this helps.
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Hi Anna,We have recommended using our GAC 400 in place of Rabbit Skin Glue, but we do not recommend using it blended with chalk or any other solids to create a chalk ground. When used to stiffen canvas or linen in place of RSG, our recommendation is to apply the GAC 400 directly to the raw fabric so it soaks in well. Allow to dry overnight, then apply a coat of our GAC 100 to block oil absorption. Finally, apply a coat of our acrylic Gesso or an oil ground to the dry GAC 100 film.We also have a newer recommendation for using two coats of our GAC 200 to stiffen canvas and block oil absorption. Then, apply either our Gesso or an Oil Ground. Alternatively, we have seen that 3 to 5 coats of our Gesso will both stiffen the canvas and block oil absorption. Here is a link to an article from our Just Paint Newsletter where we outline these methods:Preparing a Canvas for Oil Painting.
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