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 Post subject: Advice needed...
PostPosted: Sun Jun 10, 2018 4:29 pm 
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After moving into a new home we noticed a crack above a fitted wardrobe. The crack reappears when painted over. After sanding it back it turns out that one side of the crack is actually Mdf and the other is the corner of the chimney breast which is skimmed (in fact it's butted up against the angle bead). So I've tried Polyfilla and then painting over it, but it still cracked. Rather than rip it all out, is there a better way to fill and smooth it that might not crack??? Tried Polyfilla, decorators caulk, and a filler/silicone, but all cracked eventually.


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Last edited by MarkP72 on Sun Jun 10, 2018 5:04 pm, edited 1 time in total.
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 Post subject: Re: Advice needed...
PostPosted: Sun Jun 10, 2018 4:41 pm 
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Is the crack growing?

Is the area subject to movement?

Only one of the above will cause the crack to reappear. Fix the 'one' and you'll have fixed the crack issue.

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 Post subject: Re: Advice needed...
PostPosted: Sun Jun 10, 2018 4:45 pm 
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A far better way would be to fit a cover strip over the joint. You could cut one out of hardboard pinned to the mdf and painted in with the wall.
However , I'd be trying to find out why the crack reappears. Worst case is possibly serious although as it's a wardrobe I assume it's an upstairs room and it could simply be vibration from the floor , does it feel a bit bouncy for instance.


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 Post subject: Re: Advice needed...
PostPosted: Sun Jun 10, 2018 5:11 pm 
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Thanks for the replies.

I've added an image to the original post. It's upstairs above a wardrobe. Once filled and painted the crack appears but never grows bigger than a hairline. I guess the Mdf will grow and shrink enough to crack a filler or even just the paint itself.


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 Post subject: Re: Advice needed...
PostPosted: Sun Jun 10, 2018 5:16 pm 
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Grendel wrote:
A far better way would be to fit a cover strip over the joint. You could cut one out of hardboard pinned to the mdf and painted in with the wall.


Unfortunately my lass is a perfectionist. She wouldn't approve of anything other than a smooth wall.


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 Post subject: Re: Advice needed...
PostPosted: Sun Jun 10, 2018 5:21 pm 
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MarkP72 wrote:

Unfortunately my lass is a perfectionist. She wouldn't approve of anything other than a smooth wall.


She's just going to have to get used to it.

Any flat join between plaster and a timber based product will always crack.

That's why you have an architrave around a door lining, without it, no matter how stable your property and how well it's all decorated that joint will always crack.

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 Post subject: Re: Advice needed...
PostPosted: Sun Jun 10, 2018 5:34 pm 
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ayjay wrote:
That's why you have an architrave around a door lining, without it, no matter how stable your property and how well it's all decorated that joint will always crack.



I really didn't know that. :salute:

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 Post subject: Re: Advice needed...
PostPosted: Sun Jun 10, 2018 6:08 pm 
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MarkP72 wrote:
Grendel wrote:
A far better way would be to fit a cover strip over the joint. You could cut one out of hardboard pinned to the mdf and painted in with the wall.


Unfortunately my lass is a perfectionist. She wouldn't approve of anything other than a smooth wall.


Get her a nice fancy hat box and stand it in front off the crack .
Or alternatively make the cover strip as wide as the wardrobe and cover everything up .


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 Post subject: Re: Advice needed...
PostPosted: Sat Jun 16, 2018 11:15 pm 
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For future reference - looks like this is the solution for such cracks...

Ultra thin crack tape. Basically a very thin masking tape. Fill it, smooth it, tape it and add 2 or 3 coats of paint and you're sorted. Time will tell whether it works. But looks great so far.

tesa UK Professional Decorating Crack Cover Tape, 10 m x 50 mm https://www.amazon.co.uk/dp/B0057H6J0G/ref=cm_sw_r_cp_apa_dSyjBb5FKYNM1


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For this message the author MarkP72 has received gratitude : NUFC1000
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