The old paste is just something you cant avoid sometimes. You wont know its there till you PVA it, and by then, you might as well have a cuppa and relax for a bit. Make sure you do wait till its ready to hit. Dont be tempted to hit it sooner or your stuff will slide about all over the place. And PVA your next hit a lot earlier than you normaly would.
Its worse on silk type painted surfaces.
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