A keyfob is disclosed for use with a vehicle. A liquid tight container is provided; the wine exposed only to wooden surfaces. The canister mounting structure includes a canister holder having a first mounting portion for mounting the canister, and a second mounting portion for mounting the purge control valve therein. The invention also concerns a method for preparing such compositions, consistin in adding to a substantially amorphous nanofibril suspension, the additive and optionally the co-additive, then in drying the suspension thus additivated.