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Having painted thinned down emulsion onto plaster, after a considerable drying out period, I then put on a second coat. However, two bumps appeared on the wall above the fireplace. They are not soft atall therefore not blistered. The thing is, they are now decreasing in size, what's all that...

I have just bought some plaster sealer from B&Q but before I put it on, is it better to lightly sand paper the plaster prior to painting it on or can I simply get on with it?