Painting a fireplace
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Discussion

dreaddan

Original Poster:

282 posts

233 months

Saturday 31st July 2010
quotequote all
Hi, I'm trying to paint a mettle fireplace but everything I have tried has failed.
The paint develops a 'rash' of brown spots that look like rust.

I've tried some dulux primer and under coat which has also failed.
Any ideas?


Dan

Edited by dreaddan on Saturday 31st July 21:07

B17NNS

18,506 posts

270 months

Saturday 31st July 2010
quotequote all
What sort of metal is it?

Do you have a picture of the whole thing not just a close up?

It would seem like the paint you are applying is reacting with something underneath.

If it's a cast fireplace you could try stripping back to metal (heat gun or Nitromors) and starting again.

Use a primer, undercoat and gloss that specifically states on the tin that it is suitable for your application.

Simpo Two

91,210 posts

288 months

Saturday 31st July 2010
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You need a paint that is for metal.

Hammerite is an obvious example.

Laurel Green

31,006 posts

255 months

Saturday 31st July 2010
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It could be that there is bitumastic paint under the new paint and is bleeding through. A coat of aluminium primmer should stop the bleeding.

dreaddan

Original Poster:

282 posts

233 months

Sunday 1st August 2010
quotequote all
B17NNS said:
What sort of metal is it?

Do you have a picture of the whole thing not just a close up?

It would seem like the paint you are applying is reacting with something underneath.

If it's a cast fireplace you could try stripping back to metal (heat gun or Nitromors) and starting again.

Use a primer, undercoat and gloss that specifically states on the tin that it is suitable for your application.
No idea what metal it is, im guessing iron. SWMBO deicded to strip just the mantle place as the existing paint was cracked.
I can take a pic, what do you want to see?

The paint/undercoat on there is supposed to be ok - it's Multi-Surface Primer and Undercoat. I've also tryed b&q's everywhere paint.

I'll get some hammerite and see what that does.

Cheers
Dan

MrV

2,748 posts

251 months

Sunday 1st August 2010
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dreaddan said:
B17NNS said:
What sort of metal is it?

Do you have a picture of the whole thing not just a close up?

It would seem like the paint you are applying is reacting with something underneath.

If it's a cast fireplace you could try stripping back to metal (heat gun or Nitromors) and starting again.

Use a primer, undercoat and gloss that specifically states on the tin that it is suitable for your application.
No idea what metal it is, im guessing iron. SWMBO deicded to strip just the mantle place as the existing paint was cracked.
I can take a pic, what do you want to see?

The paint/undercoat on there is supposed to be ok - it's Multi-Surface Primer and Undercoat. I've also tryed b&q's everywhere paint.

I'll get some hammerite and see what that does.

Cheers
Dan
Taking it to be a cast iron fireplace the primer you have used there is water based and will make it rust ,you really need to use oil based paint on it either a of tin enamel paint or hammerite smooth.




Simpo Two

91,210 posts

288 months

Sunday 1st August 2010
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Good spot - rather careless of Dulux to say it's suitable for 'most metals'...

Elskeggso

3,100 posts

210 months

Sunday 1st August 2010
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Try shot blasting it down to the bare metal and then painting it.

B17NNS

18,506 posts

270 months

Sunday 1st August 2010
quotequote all
Simpo Two said:
Good spot - rather careless of Dulux to say it's suitable for 'most metals'...
Quite. Most metals except those ultra rare ferrous ones.

dreaddan

Original Poster:

282 posts

233 months

Saturday 7th August 2010
quotequote all
Cheers - have stuck some red oxide on.. just waiting for it to set...
edit: infact do you know how long it takes to dry?

Edited by dreaddan on Saturday 7th August 20:56

Simpo Two

91,210 posts

288 months

Saturday 7th August 2010
quotequote all
dreaddan said:
edit: infact do you know how long it takes to dry?
The small print on the tin is a good place to start (plus allowance for temp and humidity)

Merlot

4,121 posts

231 months

Saturday 7th August 2010
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I painted mine with a stove paint...

dreaddan

Original Poster:

282 posts

233 months

Saturday 7th August 2010
quotequote all
Simpo Two said:
dreaddan said:
edit: infact do you know how long it takes to dry?
The small print on the tin is a good place to start (plus allowance for temp and humidity)
I thought so too, however "repaint in 6 hours . Drying times will be extended in low tempatures" isnt quite as useful as one would hope.
Give it's been 24hours and still soft (I can press my fingerail into it easaly) im guessing it's not set

Simpo Two

91,210 posts

288 months

Sunday 8th August 2010
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'Repaintable' isn't the same as 'dry' though.

Did you stir it properly before use? If not that can hinder/prevent full drying. Hopefully you scraped off the previous attempts - if not there's probably something in those that's slowing/stopping it from drying.

Edited by Simpo Two on Sunday 8th August 09:34

dreaddan

Original Poster:

282 posts

233 months

Sunday 8th August 2010
quotequote all
I know repaintable in 6 hours isnt the same as drying. I took it to mean apply the 2nd coat after 6 hours.
I gave it a good stir also making sure I got all the sedament from the bottom up as well.
Yes, I cleaned it up again before painting

Edited by dreaddan on Sunday 8th August 10:52

Simpo Two

91,210 posts

288 months

Sunday 8th August 2010
quotequote all
Well in that case I think you've done all you can do - take the day off smile

dreaddan

Original Poster:

282 posts

233 months

Sunday 8th August 2010
quotequote all
Simpo Two said:
Well in that case I think you've done all you can do - take the day off smile
drink

Simpo Two

91,210 posts

288 months

Sunday 8th August 2010
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Good idea. After all, drinking is more interesting than, er, watching paint dry...

dreaddan

Original Poster:

282 posts

233 months

Saturday 14th August 2010
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Well, the red oxide didnt go off however the hammerite seems to be doing the job !