... wooden sleepers. To avoid the risk of the same problem I thought I would do it the other way round. I found some almost black wood dye and put a few coats on the sleepers and then glued the chairs down. It was fine for a few months then chairs started coming loose.At first I thought it was the glue not sticking to the plastic so I tried various different glues, none of which worked reliably, until I realised the problem was the wood dye. Nothing sticks to it long term. it's like Teflon!Having built a lot of track and several turnouts I am rescuing the situation as it occurs by sliding the loose chairs out of the way, grinding off the dye with a burr to expose clean wood and then glueing the chair back in position with Evostick. It is extremely tedious and much more difficult to do in situ, but apart from ripping the whole lot up I do not see another solution.Next time it will either be plastic sleepers, or use a water based paint on the sleepers after glueing the chairs in ...