NOTE TO ALL!
Nitromors have changed their formula due to a ban on certain chemicals from,,,,,,,,,,,,,,you guessed it the E.U.
I brought some cheap varnish stripper from Wickes and frankly it was useless, but at £6 a litre what should I have expected?
Brought a tin of Nitromors for £16 for 500ml, and it too was useless. My advice would be either buy the cheap Wickes product and persevere, or use the glass/stanley blade to scratch the old varnish off.