New glazing system replaces conventional putty
WHEN glazing a wooden frame using conventional linseed oil putty, the glass is first forced into a bed of putty in the primed frame. After fixing with tacks the glass is then glazed and sealed in place using more putty. Some days or weeks later the putty is dry and firm enough for painting.
Spot the disadvantages? The force required to press and bed down the glass into the puttied frame can sometimes result in glass breakage and cuts. This is why silicone sealants have been widely used to replace the bedding putty. The reaction products from the curing of the silicone sealant can cause serious adhesion and incompatibility problems. Acid cure silicones release an acid when curing which reacts with the linseed oil putty and cause bubbling and other problems. Neutral cure silicones release materials which retard the drying of the putty, delaying painting a few more days – which is not satisfactory either.
No silicone sealant should be used in conjunction with linseed oil glazing putty – however, until the recent release of the Kwik Paint Glazing system there has been no alternative.
The Bostik Kwik Paint Glazing System uses a special low viscosity fully compatible bedding compound which is applied from a conventional sealant cartridge. This  can be extruded into the rebate with no worries about cutting yourself on small glass shards left behind. The consistency has been carefully controlled to produce a bedding system which requires little effort to press in but not so thin that the material extrudes everywhere after bedding down the glass.
Bostik Kwik Paint Glazing Putty is easily malleable and has excellent thumbing properties but is still firm enough to paint almost immediately. Brush drag and bristle damage is eliminated and the putty dries quickly even under cold damp conditions. The paint will not wrinkle up or lose adhesion even if painted before the surface is completely skinned over.
(Skinning normally occurs after 12 hours, but if the weather is warm and dry a skin will form in less than two hours.)
Kwik Paint Glazing Putty comes in a foil sausage package. Simply cut a slice off the end and mould the putty into shape before thumbing it into position prior to knifing and finishing the job. The unprotected end of the sausage forms a skin which can be thinly sliced off before using a new piece.
Adhesion to glass and wooden surfaces is excellent and far better than conventional linseed oil putty. There is no need for pre-priming timber before use either.
Bostik Kwik Paint Glazing Putty has been tested by BRANZ and is fully approved for use on most glass types including tinted and laminated glass. The putty bead itself does not dry out completely, but remains slightly flexible and will take up movement and resist swelling and shrinkage in frames.
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