Acrylic dispersion Caulk products are designed to be used as a means of filling or concealing any cracks or small gaps that might arise between two substrates which may have some movement in them e.g. between a flexible material such as wood and a non flexible material such as plaster or masonry. ECT Adhesives provides a range of such filers from our partners Siroflex and Nullifier. When selecting a product for a specific application one takes into consideration factors such as flexibility, ease of sanding, ability to paint, suitability for interior or exterior work, fire resistance – ECT Adhesives have the complete range to cater for all requirements.