Use of biocidal aerogel compositions in onshore paints, coatings and sealants

The present invention relates to silica aerogels having up to very high loadings (55-90% w/w) of encapsulated biocidal and/or bio-repellent compounds and very low thermal conductivity, and to methods of making and using such aerogels in anti-fouling compositions, which are particularly suitable for coatings (marine paints, coatings, sealants, lacquers, wood protection or similar controlled leaching systems) that are naturally exposed to humid conditions and/or water (including seawater) and thus are susceptible to fouling.