Probably the best hardware shop in Oxford. Excellent knowledge, range of items. Usually cheaper that the sheds.
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VISBELLA 85ml HIGH TEMPERTURE BLACK RTV SILICONE GASKET MAKER
Heat resistant & flexible from -80°F to +600°F (-62°C to +315°C)
Excellent bonding to wide range of applications
Forms to any shape instantly
Resists cracking, shrinking and migration caused by thermal cycling
Resistance to oil, water & toxic chemicals
Pressure resistant
Makes air tight & leaf proof gaskets in seconds
Low odour & non-corrosive