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Choosing the Right Adhesive

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Choosing the Right Adhesive Choosing the Right Adhesive James Miller, MCPF, GCF Using the best glue for non- mounting applications can make the difference between just getting the job done and doing it right ramers often discuss adhesives for mounting A color marker can make joined frame corners look better, but be careful not to color the miter area being glued. The oil-based ink because it directly involves a customer’s property would weaken the glue bond. Fand is the riskiest part of the framing process. Permanence, reversibility, chemical stability, and ease of components are unknown. As a result, the best strategy use are all important factors. But these same considera- is to use adhesives that have been evaluated by conserva- tions are also important when choosing adhesives for a tion specialists. Preservation adhesives have chemistry wide variety of applications beyond mounting. known to be stable and inert, and they are available from suppliers of conservation materials, such as Decorative Framing Conservation Resources, Talas, Test Fabrics, University The adhesives used on corners, stacking matboard, and Products, and others. many other aspects of framing deserve a close look. For decorative framing, in which chemistry is not impor- Polyvinyl Acetate (PVA) tant, adhesives can be selected according to bonding For joining frame corners, liquid PVA wood glues are strength, durability, ease of use, and availability. For the most commonly used, including CornerWeld, most structural applications in a non-preservation frame, Maxim, TiteBond, Elmer’s, and other wood glues avail- PVA glue may be the best overall choice because it is able from framing distributors. When PVA wood glue is handy, easy to use, and sets up quickly. Other adhesives properly used and fully dried, which usually takes may be preferable for certain applications. overnight, it offers durable bonds that may actually be stronger than the wood. They are slightly flexible and Preservation resistant to the stresses and minor impacts expected in In preservation framing, the choice of adhesive is more normal handling and display. PVA glues are also consid- important because stable chemistry is essential. The for- ered permanent, although most of them will soften if mulations of most ordinary adhesives include binders, soaked in water. Dried PVA glue usually can be removed colorants, preservatives, and other components that from a frame finish by wiping with a damp microfiber could off-gas and react chemically, causing color shift, cloth or brushing lightly with a dampened toothbrush. acid burn, embrittlement, or other deterioration of White and yellow wood glues are available in several framing materials and the items framed. Most adhesive variaties to suit all sorts of woodworking applications. formulations are proprietary, so some of their chemical White glues are most commonly used by framers and 22 PFM January 2014 comeGluing with Corners a variety of open and set-up times. Open time refersJoining to frame the corners short isperiod one of the of mosttime fundamental when the tasks joined in framing, surfaces but canmany be framers flexed have or difficultymoved with before that, asthe evidenced glue begins by questions to set such up, as, which“How can can I get be stronger as short miter as joints?” one minute or “What isor the as strongest long as frame five glue?”min- utes,Usually, depending weak frame cornerson the are glue. due toIt issuesis important other than theto adhesive.complete Here are some useful tips: the joining process within the glue’s open time. Set-up is 1. Make sure the frame corners fit together with no gaps. Incorrect miter theangles time may required result from for improperly the glue adjusted to dry cutting enough tools. to be handled, and2. Sand the away bonded burn marks, surfaces which must typically remain are caused undisturbed by dull saw blades,during set-up.especially Waterproof on hardwoods. wood Burn glues marks willseal theresist surface weakening and impede due absorp- to exposuretion of the to glue moisture into the end-grain. more than other glues, but that’s gen- erally3. Miter not surfaces important need to be in clean framing. and have After no residue all, if of asawdust, frame cuttinggets Apply a thin film of glue over the entire area of the miter. Applying only a lubricant, skin oil, hand lotion, or other contaminants. If you use markers to spot of glue in the center of the miter usually is inadequate, as the glue soaked, chances are that softened glue in the miters would may not flow over the whole surface when clamped. color the edges of miters, avoid coloring any of the area to be glued, since be a low-priority problem. In the final analysis, nearly any the glue would not bond as well to the colored surface. good4. Apply quality a thin film PVA of glue wood over theglue entire would surface provide of a miter. strong, Do not placedurable a bondingspot of glueof framein the center miters. and expectOther that types it will of spread adhesives across the could whole be usedsurface for gluingwhen clamped miters because but could that usually dry won’ttoo quicklyhappen. A or20 percentrequire longerreduction drying of glued time, miter and area they can significantly may not weakenprovide the bond strength of the strengthbond. If equala small toamount the oftypical glue oozes PVA out, wood use a dampglues. cloth, paper towel, or toothbrush to remove it before it dries. Nearly all modern frame finishes will easily withstand this gentle cleaning process. Fabric5. Complete Glue the joining process within the glue’s open time and, once the cor- Theners adhesives are joined, usedallow theto glueattach to set fabrics up undisturbed. to matboards Any movement are usual- of the ly PVAsurfaces formulations during the set-up with time a can heavier weaken viscosity the bond. Mostthan frame frame glues require at least half an hour to achieve workable bonding strength and sev- When clamped, a small amount of glue usually oozes from the miter glues. A typical process is to roll the adhesive on the board joint, which is easy to remove using a dampened cloth, paper towel, or eral hours to dry fully. toothbrush while it is still wet. 24 PFM January 2014 surface, let it dry, then activate the bond using heat from a drymount press or an iron. If the fabric is heavy, per- haps it could be applied while the glue is wet or just beginning to set up. Since fabric adhesives are thicker than frame glue, they have fewer tendencies to soak through. Fabric glues are also suitable for attaching dust- cover paper to a frame back, and most could be used for frame miters, as well. Ethylene Vinyl Acetate (EVA) To bond layers of mats, use dots of glue, such as the acrylic gel shown Several variations of EVA adhesives are available from here, in addition to a few small spots of ATG (circled for clarity). The dots of hard-setting glue hold better, cost less, and the layers can be separat- suppliers of conservation materials. They are suitable for ed easily in the future. ATG alone can flow and fail, since activating the joining miters and for most of the other uses of PVA in bond by pressure or burnishing through the mat layer would be difficult. This same technique works for shadowbox mat-walls. framing. EVA glues are generally water soluble and, since they are usually formulated for preservation applications, they generally contain fewer additives that could be of acrylic resin adhesive polymerizes in the presence of chemically unstable or reactive. When water-solubility moisture, so its curing time is affected by humidity in (reversibility) or chemical stability is important, such as the air and moisture content of the materials being inside preservation framing, use EVA instead of PVA. bonded. Since the wood and paperboards used in fram- ing contain some moisture, CA glue bonds quickly in Cyanoacrylate framing applications. CA glue creates very strong bonds, The brand name Super Glue has become a generic term but some care is required in its use. If any of the glue for cyanoacrylate, also known as CA adhesive. This type oozes out of a corner during frame joining, it would 26 PFM January 2014 ruin most frame finishes. Cyanoacrylate glue has not together, which may be necessary to make 8-ply, 12-ply, been marketed as frame joining glue in the past, but or thicker mats. Starch paste can also be used to attach Framebond, a new formulation of CA for frame joining, float-mount spacers to a backing board or to assemble is being introduced as of the WCAF Expo. matboard and foamboard layers into shadowbox walls. Its main advantage is chemical stability, which results in Acrylic Medium very durable, long-term bonding. Since the adhesive Acrylic medium is commonly used by artists to condi- consists only of natural cellulose, its bonding strength is tion acrylic paints, and it comes in several versions of limited, so starch paste is not suitable for anything under liquid and gel. Similar to PVA and EVA, acrylic medi- significant weight or stress, such as frame miters. ums are water-borne polymers that dry quickly when used to bond porous surfaces. However, acrylic medium Hot-melt Glue is free of invasive chemistry, so it is suitable for preserva- Hot-melt glues are most suited to applications where tion framing. It can also be heat-activated after drying, immediate hardening is desired. For example, when which makes it a suitable adhesive for fabrics as well as embedding metal formed-rod mounts in a fluted for paper and other porous materials. polypropylene mounting board, hot-melt glue enables the adhesive to harden while the mount is manually held Wheat or Rice Starch Paste in the correct position.
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