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 Post subject: Fixing cornice
PostPosted: Sun Aug 20, 2017 9:12 am 
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I have a cornice which the previous owner cut thin sections (about 2cm wide) out of it when installing a built in wardrobe.
I'm now trying to fix it.

There are 4 cuts in total. 2 are on the chimney breast where the mitre was.

First I tried to make a silicon mould and then used plaster of Paris to make new sections from the mould. This kind of worked but looks a bit rubbish. The silicon mould didn't hold its shape well so some angles were off.

I'm not sure this will work well for the corner sections.

I'm thinking of using a mouldable putty instead and shaping by hand.

Can anybody suggest a good hand mouldable material I can use?

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 Post subject: Re: Fixing cornice
PostPosted: Sun Aug 20, 2017 10:59 am 
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Is this standard cove or a bit more elaborate?

If I understand you correctly there are narrowish gaps to be remade. I think I would approach this by making up a profile out of wood to precisely match the cove. I would slap a load of plaster in the gaps to give a good base for the final moulding plaster to bed on. When this is dry get your plaster of Paris well seated on this bed and standing proud by a few mm. Then with your profile comb well dampened run it along the cove to form a continuous profile. A lot of this is getting the timing right in the narrow window of the PoP drying. :thumbright:


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 Post subject: Re: Fixing cornice
PostPosted: Mon Aug 21, 2017 8:47 pm 
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20mm gaps canbe pva pasted and filled with any filler leaving about 3mm clearto fill. when the filler dries pva again and just skim with a little finish.shape it to match the profile and sand if it needs it.

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