In terms of cost effectiveness, polystyrene coving can be less expensive than other materials. Thanks Kirkuk, 5 Nov 2013 #1. If it has just been put in place it will probably take at least 3 coats. ... Painting Polystyrene Coving to Hide Joints by Garffy13 » Fri Jan 18, 2019 9:12 pm Last post by gc1967 … 944fan 4,962 posts I'm planning on painting the woodwork with one coat brilliant white gloss and was hoping to do the same with the coving to give that devision between the wall and the ceiling with the colours. I painted a room last week and put up polystyrene coving and painted over it but it appears to of absorbed the paint, i just used white emulsion, same as the ceiling, 2 coats!. Visit your local craft store or go online to find acrylic paint in a color of your choosing. Acrylic paint is the best type of paint you can use on styrofoam, as it won't cause damage and sticks to the styrofoam well. I am doing up my house to rent and have a polystyrene ceiling and coving in the kitchen. Source(s): Decorator for over 20 years. Hi all, we put up polystyrene coving in the lounge a couple of years ago and are only just getting round to finishing it off, there are some noticeable joint gaps between pieces which I would like to fill before painting. Brian any tips/hints would be mucho appreciated!! Pick out enough paint to cover all of the styrofoam. As for the appearance of bare polystyrene coving, yes I agree it does look cr*p. So I mix up a runny mix of some sort of filler (maybe artex - can't remember what I used last time) and paint it on the coving to hide the polystyrene grain. Sand it smooth then paint it. On the Homebase website it suggest a lightweight coving adhesive, however, I read the reviews and they are not that great - one person used it with panel pins and the following morning on removing the pins, the coving started to fall down. 2. No great loss if I can't use Gloss, I'll go and get a small can of brilliant white imulsion. Emulsion, Matt finish is best for coving and ceilings. Mind you, It needed careful handling as if mishandled, you can make many dents into it - since it is made of similar material as polystyrene. I found the lightweight coving very easy to handle, cut and fix to the walls. Thank you. I've stripped the hall in readiness for skimming, if I could get away with it I would like to just try and skim the polystyrene coving covering the down pipes. Thanks! Can somebody tell me what they have used to stick up the coving, if they used the polystyrene type? Joined: 9 Apr 2010 … I painted over it to blend it to the wall / ceiling decor. What's the best way to cover these joints is there any paint that would do the job. THANKS But it looks more pleasing to the eye. HERTS P&D. 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