This is a closed forum for information only and this post also serves as an index for this subforum.
We are copying information from threads in the Oils forum (and occasionally from other forums) in order to try to compile good general guidance on technical issues. Please note that these threads are being ruthlessly edited to get down to core technical info, as concisely as possible, so please don't take offence if your posts have been removed or edited here, full copies of the threads are in their original locations.
This subforum is read-only, again for clarity. We recognise that on many issues to do with oil-painting, there is a range of opinion - here we are trying to give clear guidance to those unfamiliar, so will err on the side of simplicity.