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Resurfacing a Cast Iron Enamelled Bath.

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blowlamp30/03/2019 19:16:38
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1184 forum posts
82 photos

I'd like some advice from forum members on refinishing a bath tub please.

I did this job about 4 years ago and it lasted very well until quite recently.

When I first did this job, an area of the original enamel had eroded by about 2 - 3mm around the plughole, so to prevent pooling I filled it with Chemical Metal and I now think this may be what has caused the failure.

What has happened is that the Chemical Metal filler has parted (very cleanly) from the original enamel by a process that looks like the fresh enamel has bonded (perfectly!) to this filler and then slighly shrunk over time thus pulling the filler off the bath. It basically curls up and breaks off.

From what I can see, wherever the new enamel covers the original enamel, then the bond appears excellent and is without any sign of failing.

I suppose I need advice regarding a suitable filler that sticks really well to the original enamel, along with hints & tips about anything else I should take into account.

I used the Rustoleum refinishing kit, if that is important to know.

Thanks.

Martin.

David George 131/03/2019 08:35:06
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756 forum posts
261 photos

Hi Martin have you rung Rustoleum help number on the web site I would have thought they would have come across this sort of problem.

David

Barrie Lever31/03/2019 10:09:11
177 forum posts
38 photos
Posted by blowlamp on 30/03/2019 19:16:38:

I'd like some advice from forum members on refinishing a bath tub please.

I did this job about 4 years ago and it lasted very well until quite recently.

When I first did this job, an area of the original enamel had eroded by about 2 - 3mm around the plughole, so to prevent pooling I filled it with Chemical Metal and I now think this may be what has caused the failure.

What has happened is that the Chemical Metal filler has parted (very cleanly) from the original enamel by a process that looks like the fresh enamel has bonded (perfectly!) to this filler and then slighly shrunk over time thus pulling the filler off the bath. It basically curls up and breaks off.

From what I can see, wherever the new enamel covers the original enamel, then the bond appears excellent and is without any sign of failing.

I suppose I need advice regarding a suitable filler that sticks really well to the original enamel, along with hints & tips about anything else I should take into account.

I used the Rustoleum refinishing kit, if that is important to know.

Thanks.

Martin.

Martin

What sort of chemical metal did you use? Polyester based metal fillers will not get as good a 'bite' to the surface as epoxy types, the best epoxy based products will also have additional keying agents within their composition.

When you say that the flakes falling off curl, that would imply that there is a fair degree of shrinkage in the Rustolem product.

With any bonding operation the key to success is in the preparation and that might be quite a bit more effort than expected.

Regards

Barrie

Edited By Barrie Lever on 31/03/2019 10:10:02

Edited By Barrie Lever on 31/03/2019 10:10:33

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