Fill the gaps with Polyfilla or similar - either ready mixed or make it up yourself. Leave to dry then sand lightly. When painted or papered over, the gaps should be invisible.
I personally would not use any type of ready mixed filler. It dries too hard and is difficult to sand down. Normal power filler is better as it is softer to rub down without damaging the face of the paper.
Thanks for the replies so fare. Can I ask another question please.
I need to paint a wall that has been plastered with dirty great snots on it, a bit like you see in Spain. No roller would do it. I have tried with a standard 2 1/2 inch brush, but it has taken me hours to do a small area. Is there a better brush that I could use?
I personally would not use any type of ready mixed filler. It dries too hard and is difficult to sand down. Normal power filler is better as it is softer to rub down without damaging the face of the paper.
Perhaps it depends on the brand you use and how old it is. I've used Polycell ready mixed filler and that was fine - used sparingly, it sanded down just the same as mix-it-yourself stuff.
I wouldn't use decorator's caulk for gaps in paper - too rubbery, can't be sanded down.
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