Paving Round Track

I'm currently building the large quarry terminal on my layout ('Jadis Aggregates' continuing the C. S. Lewis theme!) and decided to pave round the track in the terminal.





So I sprayed some 30 thou plasticard concrete grey having cut it to the correct size (7mm wide seems to work for between the rails). When this was dry I attempted to stick it down directly to the sleepers using poly cement. This doesn't seem to be the best solution - is there a better glue to use or a different method?

In the end it seems that 30 thou is too thick, so next time I'll try 20 thou. Trial and error seems to be an essential part of this hobby!

Thanks for any replies.