Premium quality acrylic, the Everbuild Caulk Once has been designed to outperform all conventional decorating caulks and fillers. For sealing and filling gaps and cracks, or use around skirting boards, ceiling cornices, window and door frames, stair treads and risings, and fixtures adjoining walls. Fast drying Permanently flexible Over-paintable in 1 hour Interior and Exterior use Easy water clean-up Excellent slump resistance CE Marked