Bare plaster paint on new plastered walls

Hi there . Based on your description it sounds like it has been caused by heavy roller use . Sanding down with a fine sandpaper is an action that should be taken after a mist coat on all bare plaster , this is know as de-nibbing . Once you have done this apply another coat of paint evenly and you will lose any rough textured look

Hello, firstly you don't have to buy a special paint for new plaster any decent matt emulsion will do as long as you add water to it to loosen the paint, be careful of the amount of water you add to it to much will have it dripping every where, and use a short pile roller sleeve, unfortunately the only way I can see to take those lumps out is to either scrape off with a scraper or sand with fine sandpaper, I hope this helps.

Hi. Difficult to say what the 'bumps' are without seeing them. But possible causes are: New roller sleeves shred some of their content on first use, how much depends on the quality of the roller. You do sometimes have small lumps in the paint but this usually happens with vinyl type paints. I havent used paint for new plaster from screwfix but often with these paints i dilute. Its a case of monitoring how the plaster absorbs the paint, if it doesnt then problems as youve described can occur. Looks like you will have to sand. Have a look at the manual sanding thats done on dry wall applications, a pad is used that can be fixed to an extension pole, meaning that you can be a distance from the sanding dust ( but also take all the usual protection from dust inhalation, mask etc) The good news is that you used paint for new plaster, one of its benifits is that its designed to be abraded once dry ( as a mist coat is always part of the preperation stage) And this is why its immportant to use paint for new plaster and not a vinyl paint on the mist coats