The wet edge

My son is an artist, among other things, and told me about the need to keep the wet edge going in certain sorts of painting. Don’t ask me what sort, I’m here to talk about writing. So, right or wrong, and I’m not checking effing Wikipedia, I say that leaving a story unfinished for too long can make it hard to resume. This I suppose is like the wet edge that you have to keep going. Also, I read an idea recently from someone that you should stop writing each day (yes, in case you didn’t know, you’re supposed to do it every day – do as I say, not as I do) when you still know what you want to write next, instead of draining it all out, the theory being that it will then be easier to resume.