The new window putties
The main advantage of traditional putty is that is easy to apply. Its linseed-oil base means that it doesn’t stick to the putty knife and it’s relatively easy to get a good finish. You have to wait a few days or even weeks before painting it (read the pack), but that’s not always a big deal. However, it will continue to dry out over time. Make sure that you paint bare timber before using it or the oil will leach out even faster. Silicone gels are great for fixing glass in metal and vinyl frames, but don’t use silicone sealant around putty — when it cures it gives off an acid that attacks putty. Selleys national sales manager Phil Ayling says that glazing compounds are a step up from oldschool putty and allow painting within a few hours, rather than days. They remain flexible and, while they are more expensive, they are gaining in popularity.