Sanding before mist coat, or after?

Hi, From my personal experience, I try and do all the sanding/filling before the mist coat. Depending on how severe the uneven parts are, these are the steps I’d take: You can go over with a scraper any long lines left over, then sand down the worst of it with grit 120 (even 80 if it really is terrible in some places). Wipe it down with a damp cloth, with a lamp find all the holes and uneven parts and fill them in. Let that dry, sand it all with 180, fill in again, sand again. For a really profesional finish I then use a fine filler (max 1/2mm), and then sand with 240. After that mist coat and then two coats of paint. There are a lot of different opinions online but personally that method has never let me down! Also make sure the plaster is fully dry before doing any work! Give it at least a week! Hope this helps.

Yes and after

Personally I would sand back ,lets say, any obvious imperfections (!) then a mist coat will show up the worst areas, a light will help if you're being very picky then easy fill is probably your best option, then repeat until you're happy.

I would give it a sand first and then mist coat and if there's any imperfections that require filling can be spotted better with the mist coat .

If you're doing this for the first time, you'll probably have some problems with application, and that's normal. To achieve a good result, be sure to sand the wall with 100-grit sandpaper before applying the finishing coat. Remove any visible bumps. Then, sweep away the dust and wipe the wall with a damp cloth. Prime the wall with well-diluted PVA. Apply the finishing coat. To achieve a good result, position the lighting as close to the wall as possible so that the light hits the wall from the side. This way, you'll see all the imperfections and the work will be done correctly. Good luck and good results.

Cannot believe some of the answers so called tradesmen are putting down. Please note : You should ALWAYS mist coat BEFORE You do any rubbing down and filling You should Never rub down new plaster before the mist coat.

Because it’s a DIY skim and not a pro finish, the lumps and bumps need dealing with before the mist coat. Sand the wall first to knock everything back 180 grit for localised high spots, then 180–240 lightly over the rest. Any bumps could be trowel marks or air pockets, so once you’ve sanded you’ll almost certainly need to fill low spots, let them dry, and sand again. Only once the wall is as flat as you can reasonably get it should you apply the mist coat otherwise you’ll just seal defects in and make them more obvious later.

What wecgenerally do is Sand with a fine abrasive P180 grade if needed.

Simple Give it a general sand down on the affected areas , mist coat it , let dry , once dry give it a final sand with any of the 180 or 240 that you have . The basic idea is that you will see the imperfections much better once the mistcoat it's applied. All the best

We like to give it a sand before and after. Generally a light sand before is enough. Making sure any lumps are removed. And then mist coating will highlight the scaps and dents.

Give light sand over with 180 grit this will get your lumps out then check with a light for any inperfections then use a fine filler

Slightly go over with pole sander,dust off and I would use sponge clean away dust then put your 50/50 on. (Paint & water)

Light sand. Mist coat. Fill where necessary. Light sand. Full coat. Light sand. Final coat. The sanding helped the coats adhere it’s not just to get a smooth finish.

I recomand easy sanding before mist coat and then after the mist coat do some filling , sand down , touching up , ready for final coat.

In most cases you want to sand and remove the main bumps before the mist coat. After a wall has been skimmed it’s normal to have a few small imperfections. I’d lightly sand the worst areas first (around 120–180 grit) just to knock down any high spots and lumps. Then apply your mist coat. The mist coat will highlight any remaining imperfections much more clearly. Once dry you can fill any small dents or lines, sand again with a finer grit (180–240), and then apply your two finishing coats of emulsion. So in short – sand the worst areas first, mist coat, then do final filling and sanding before the top coats.