As a silicone-based sealant, 3C Glazing Putty cures as a slightly tacky, hardened paste. Often times, the user will purposely apply the material in excess to make it proud of the surface or to put it simply, more than required. Unlike a traditional silicone sealant, it has a porous texture once fully cured which makes it pliable and acceptable to shaping with tools such as a sander or plane etc.
With great adhesion to most common substrates used in design & build construction, 3C Glazing Putty is marketed as a replacement putty product that tends to be used in applications where glass is bedded and/or sealed to another surface. Traditionally, with such design configurations as sash windows, timber features predominantly and obviously 3C Glazing Putty performs perfectly well but as trends have evolved, so to have the materials used in frames etc. so it's handy to know that the adhesion and performance on other porous and even non-porous surfaces such as metal or plastic is equally excellent.
As paint systems change over time, we've found that much caution should be exercised when treating 3C Glazing Putty as a dedicated 'over paintable' as such. Although considered a putty, it must be realised that the material is indeed silicone-based and sometimes proves difficult for some paints, varnishes or other coatings to adhere to. This said, with a small test area, one can determine if the chosen paint or coating will be compatible.
As with traditional putties, 3C Glazing Putty can be used equally well in respect of new build installations and also renovation, refurbishment or remedial works. When planning to either start a new frame configuration or cut out and replace an old material, the preparation would be similar in as much as the surface to bed into and the 2 x substrates that will connect to each other, must be clean, dust-free, dry and degreased (if required). As with all projects, a small test area should be tried before undertaking any major works.