I have searched and read in countless threads about plastering chimney stacks and have become somewhat wiser but not completely.
We have a chimney stack that consists of mexitegel at the lower part and plaster at the upper part. The house was built in '68. Now I want to plaster the entire chimney stack smooth and paint it white. After this is done, we plan to install a fireplace insert.
I have been recommended cement mortar C to use for plastering, but I have understood that it CAN be difficult to get it to adhere to mexitegel, though I have read about others who have succeeded with good results. Wetting thoroughly beforehand seems to be the key.
BUT.... the upper part which is now plastered is also painted with some kind of paint. How do I get the plaster to adhere there? I checked the possibility of chipping away the old plaster, but it clings like a rock in parts, and I do not want to risk a crack in the chimney stack, which is used for pellet burning, among other things.
My question is... can I score the paint and try to prime with some primer? Or should I mix cement mortar C thinly with water and paint it on as a type of primer before plastering?
We have a chimney stack that consists of mexitegel at the lower part and plaster at the upper part. The house was built in '68. Now I want to plaster the entire chimney stack smooth and paint it white. After this is done, we plan to install a fireplace insert.
I have been recommended cement mortar C to use for plastering, but I have understood that it CAN be difficult to get it to adhere to mexitegel, though I have read about others who have succeeded with good results. Wetting thoroughly beforehand seems to be the key.
BUT.... the upper part which is now plastered is also painted with some kind of paint. How do I get the plaster to adhere there? I checked the possibility of chipping away the old plaster, but it clings like a rock in parts, and I do not want to risk a crack in the chimney stack, which is used for pellet burning, among other things.
My question is... can I score the paint and try to prime with some primer? Or should I mix cement mortar C thinly with water and paint it on as a type of primer before plastering?
You won't get the plaster to stick to the paint. Choose Gypsum instead. Prime the painted section with their primer.
Called a construction company today regarding gypsum and it was ridiculously expensive... the primer I would need about 0.5 liters of was sold in large containers for 750 kronor. Doesn't seem like a good option to spend so much on something that won't be used again.
I was recommended another product that sounded very interesting. Isola-Platon Hey'di mortar which is available pre-colored. It didn't cost quite as much at least, and there was also primer.
Does anyone have experience with this?
I can't make sense of all the different recommendations. A mason I spoke to recommended something completely different that I can't even remember the name of... sodeko mortar or something similar. This due to the problem of getting it to adhere to the Mexican brick... but now it's the painted plaster that's the problem.
Or can I go over the plaster with coarse sandpaper by hand???? Does all the paint have to be removed for it to adhere? Or if I can use Hey'di then that would be great... then I don't have to paint afterward
More good advice, please?!
I was recommended another product that sounded very interesting. Isola-Platon Hey'di mortar which is available pre-colored. It didn't cost quite as much at least, and there was also primer.
Does anyone have experience with this?
I can't make sense of all the different recommendations. A mason I spoke to recommended something completely different that I can't even remember the name of... sodeko mortar or something similar. This due to the problem of getting it to adhere to the Mexican brick... but now it's the painted plaster that's the problem.
Or can I go over the plaster with coarse sandpaper by hand???? Does all the paint have to be removed for it to adhere? Or if I can use Hey'di then that would be great... then I don't have to paint afterward
More good advice, please?!