Abstract: There is disclosed a dispersion comprising fluorocarbon resin having a particle size between about 0.05 and 0.5 micron and a viscosity less than about 15 centipoise. The dispersion may contain a freeze/thaw additive, and is suitable for coating surfaces to form a dried film upon which insects cannot climb, alight or make nests or webs.

Abstract: A coating (17) and a method for its preparation are disclosed which will restrict the movement of insects over a skewed surface (15) to which the coating is applied. The coating (17) is an adherent thin film comprised of particles of less than 5 microns. The dispersions are prepared using a surfactant. The surfactant may be removed, at least in part, from the film by leaching or evaporation. The dispersion may also include a dispersing agent which need not be removed from the film. Stabilizing agents may be added to protect the dispersions from freeze/thaw cycles. The coatings (17) are preferably applied by spraying or roller coating the dispersion over the surface (15).

Abstract: Aqueous dispersions of PTFE and TiO.sub.2 stabilized from the effects of freeze/thaw cycles are disclosed, wherein the stabilizing agents are monohydric alcohols and monoamines having less than five carbon atoms.

Abstract: Crawling insects are caused to abandon sites they have infested or prevented from infesting other sites by preparing dispersions from selected minus 10 micron particles and forming a film on the surface to be protected. Different insects can selectively be controlled by adjustment of the particle sizes in the dispersion.