For perimeter sealing of external wood, aluminium and uPVC door and window frames and for weather sealing and flexible jointing of infill panels. Can also be used on concrete, plaster and mortar. Note: Not suitable for use with aquaria or for use on bitumen or asphalt. This product cannot be over-painted. Risk of yellowing in low UV light situations (e.g. if used indoors) whilst curing. Note: Sealant may crack if exposed to movement before it is suitably cured, therefore joints should be protected from movement for at least 3 hours after application.