SX Instant Paintable Caulk is a new sealant developed by Siroflex which can be instantly over-painted. SX Instant Paintable Caulk has been designed to save the user time, money and effort. It is easy to apply, dries quickly and can be painted over immediately with water-based and synthetic paints. It has also been designed to adhere perfectly without the use of a primer to most surfaces. Siroflex says its new product has a low odour, does not discolour paint and is not corrosive towards metals. It can also be used for the sealing and filling of gaps and cracks where movement occurs, such as between plasterwork and window frames, door frames, skirting boards, windowsills and architraves.