Sticky foam

System for impeding access to a space by attack with individual hand tools to gain entry to the space comprising in combination a reservoir portion containing a gas under pressure, a conduit portion communicating with said reservoir portion disposed to impede access to the space, sticky foam generating composition of high tenacity contained within the conduit portion, said reservoir and communicating conduit portion together forming a closed system with impervious walls normally maintaining said composition in substantially liquid condition under pressure, the tenacious sticky foam generating composition contained within the conduit comprising a tacky polymeric resin intermixed with a low boiling solvent and under pressure of said gas, rupture of a wall portion of said system effecting rapid exuding of composition through said rupture and formation of a sticky hand-tool-engulfing foam of high tenacity.