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Old 04-19-2019, 01:27 PM   #1
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Painting interior lava rock wall


I've got several walls that date the house so am wanting to paint white to minimize the look of them. I've done the main one with primer and some good paint but the look isn't right. We don't like the deep mortar joints between the rocks...guess I should have filled them first but oh well.

So now to try filling them and I can think of a few options:

1) Mix up some mortar, tint it white, and take the time to pipe it in with a grout bag. This would be messy and laborious and I'm worried that the mortar might not adhere to the paint that I've already sprayed on there.

2) Use a ton of silicone caulk. Not worried about adhesion, but again it will take a lot of tubes and take some time and be messy. Good caulk is paintable and will last a while so this isn't a bad option.

3) Spray foam from a can. This is the easy way out and would be pretty quick to do. I know you can paint the stuff and it would quickly fill all the gaps.

I'd love to get your feedback and suggestions for this. Pics to follow.
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Old 04-19-2019, 01:31 PM   #2
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Re: Painting interior lava rock wall






You can see the gaps are quite deep. We're also going to go with a flatter, less white paint for the final coat once we've figured out how to solve the mortar joints issue.

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Old 04-19-2019, 01:33 PM   #3
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Re: Painting interior lava rock wall


not sure why the pics aren't loading
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Old 04-19-2019, 01:33 PM   #4
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Re: Painting interior lava rock wall



Last edited by grinner; 04-19-2019 at 01:35 PM.
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Old 04-19-2019, 01:59 PM   #5
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Re: Painting interior lava rock wall


I'd never paint rock.
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Old 04-19-2019, 03:00 PM   #6
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Re: Painting interior lava rock wall


Mortar won't adhere well to paint.


I'd try to live with the mortar joints although you could probably use a setting compound to fill them. Only way you'll get a slick finish wall is to frame up a wall and hang drywall.
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Old 04-19-2019, 03:39 PM   #7
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Re: Painting interior lava rock wall


Quote:
Originally Posted by mark sr View Post
Mortar won't adhere well to paint.


I'd try to live with the mortar joints although you could probably use a setting compound to fill them. Only way you'll get a slick finish wall is to frame up a wall and hang drywall.
It's just not an option here because the wall is angular and the room is a little small.

I wish my pics would upload.
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Old 04-19-2019, 03:46 PM   #8
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Re: Painting interior lava rock wall


OK try this...annoyingly the images have decided to rotate themselves. But you can at least see the before and after
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Painting interior lava rock wall-20180424_105654.jpg   Painting interior lava rock wall-20190419_101454.jpg   Painting interior lava rock wall-20190419_101446.jpg  
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Old 04-19-2019, 03:59 PM   #9
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Re: Painting interior lava rock wall


Oh boy. That there is a lot of crevices to fill.
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Old 04-19-2019, 04:01 PM   #10
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Re: Painting interior lava rock wall


If I had to fill them I'd use a setting compound like Durabond or EasySand ..... but I wouldn't want to be the one to have to do it! Keep a wet rag handy to clean the excess and smooth out the joints.
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Old 04-19-2019, 04:04 PM   #11
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Re: Painting interior lava rock wall


Quote:
Originally Posted by mark sr View Post
If I had to fill them I'd use a setting compound like Durabond or EasySand ..... but I wouldn't want to be the one to have to do it! Keep a wet rag handy to clean the excess and smooth out the joints.
Do you think I could mix it fairly loose and pipe it in through a grout bag? The finish does not have to be perfectly smooth since the rock is textured already.
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Old 04-19-2019, 04:07 PM   #12
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Re: Painting interior lava rock wall


Hoping to end up something like this:
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Old 04-19-2019, 04:08 PM   #13
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Re: Painting interior lava rock wall


Probably, I've never used setting compound that way but that should work. Like grout, setting compound has a short pot life so you only want to mix however much you can use before it starts to set .... and clean the bag/tip promptly.
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Old 04-19-2019, 04:09 PM   #14
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Re: Painting interior lava rock wall


Quote:
Originally Posted by ZEW496 View Post
Oh boy. That there is a lot of crevices to fill.
I know!...and I have five other rock walls in this house. Seems it was all the rage in 1981.
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Old 04-19-2019, 11:00 PM   #15
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Re: Painting interior lava rock wall


Not for nothing but wouldn't tearing it out and putting up sheetrock be a better long-term solution? I just don't see this getting to a point where it looks good....
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