Adrian, the spray should work its way through between the leaves even if you can spray just one side. With no dampers connected, the rear of the car should bounce a few times after say kneeling on the rack and releasing, then set the bump damping.
Worth a try - PJB.
PS Although no road vehicles still use friction damping in their suspension, there is at least one recent/current military vehicle still in use with friction damping - a tracked vehicle made in USA. It uses the 'Hartford' type dampers but as the 'scissors' are worked in bump direction they tighten up to increase the damping in bump, hence there is no bump stop as such - the friction gets so great as the pade are squeezed the bump travel is eventually halted - one has to then hope that the suspension spring is compressed enough at full bump to release and return. Good idea, another piece of useless info, one day maybe.....
