Hi - please forgive a novice what might be an obvious question, but I'm using Farrow and Ball paint on my interior woodwork & the advice sheet says that their primers should be diluted with 5-20% thinners.
Can anyone tell me what thinners are? Meths, turps, white spirit or a specific product for the job? I don't want to mess up a batch of expensive paint and/or spoil the finished effect.
I'm using their aluminium based primer and oil undercoat.