Preparation and laying resin glues

The groundwork/substrate is prepared in the same way as for hammer veneering, laying the veneeers 'with the grain' on solid wood and 'across the grain' of plywoods, etc. The surfaces should not be roughened or keyed except for a light sanding to break through any surface glazing or grime, followed by a thorough dusting to clean the fibres. Any generalpurpose single-application resin glue can be used for cold pressing at room temperatures, but special veneering glues such as Aerolite KL (CIBA (ARL) Ltd) with gap-filling powder hardener are preferable. The glue should be mixed exactly in accordance with the maker's instructions and applied to the groundwork in a thin coat, spreading it evenly with spatula or palette-knife, or more satisfactorily rolling it out with a photographic rubber roller or trough hand spreader, carefully checking for bare spots, as there will be no surplus glue to level them out in the pressing, and allowing a few minutes air drying according to the make of glue. Cramping/clamping pressure in handwork can be as for caul veneering with hide glue, but the bearers need not be rounded, always providing that they press in the centre, and a good test of this is to insert tags of newspaper under the bearers which should be firmly gripped when the cramps are tightened. As there is plenty of time for assembly both face and counter (backing) veneers can be laid at the same time with an interleaving of paper, cellophane, or waxed hardboard to prevent the veneers sticking to the cover boards or cauls. Setting time will be according to the type of glue and the working temperature, but work under strain should have more than the minimum before the cramps are released. For more detailed information as to working procedures, reference should be made to the printed instructions of the manufacturers concerned.

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The Complete Guide To Wood Finishing

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