Toluene will swell PDMS and disrupt the structure.  I would suggest changing the
solvent to a less aggressive one.


> Hi..
>
> Toluene solvent is good for thinning PDMS. I have used it for getting
> PDMS films down to submicron level with extensive dilution of toluene. I
> guess, it would be ok for dilution of polystyrene too. Probably, you
> could do the surface prep before spinning on polystyrene. Like cleaning
> surface with methanol and then plasma activation and then do immediately
> coating of polystyrene.