r/DIYUK • u/Superdudeo • 23h ago

Best way to prepare this surface for painting?

Gallery image

Gallery image

Gallery image

Last pic is what it looked like before. Do I need a concrete sealer/ primer first?

11 Upvotes

92% Upvoted

29 comments sorted by

21

u/DaBobMob2 23h ago

Don't...

Leave it as it is. If you're trying to seal it, do something clear.

You'll be forever painting it once you start.

-9

u/Superdudeo 23h ago

I need to paint it though?

3

u/DaBobMob2 22h ago edited 22h ago

It's stone right? I don't have any knowledge of stone, I'm assuming it either needs sealing, or it doesn't.. from a moisture stance?

I'm not a fan of painted stone, or bricks.. I like them to look as designed, plus, paint always inevitably starts to flake and look awful.

I've been down voted, so may be a technical reason I'm missing? I hope the down voter passes on the reasons if they ARE indeed technical and important.

1

u/petrifiedturkey 22h ago

I was thinking leave it natural but op asked how to paint it

-1

u/Superdudeo 22h ago

I agree with you however the house is already painted so it would be very expensive to sandblast back to bath stone. I’m resigned to painting it.

1

u/Lonely-Speed9943 8h ago

It'll cost even more to replace the Bath stone once the paint traps water behind itself and causes the stone to crumble. Best thing to do is remove any paint that's on it.

-9

u/ThePistachioBogeyman 22h ago

Downvoted because he asked how to paint, not if he should paint.

3

u/DaBobMob2 22h ago

That's a fair point. Didn't know of OP realised there were other, non paint related alternatives, though.

1

u/Admirable-Half-2762 2h ago

Don't paint over stone please

1

u/WiseFloss 2h ago

I’m gonna say Zinsser Peelstop

0

u/jamiexscottt 23h ago

Prioritize applying a stabilizing solution to the surface to ensure a secure bond. Subsequently, proceed with painting the surface using a masonry paint.

0

u/chopsey96 23h ago

Is this ChatGPT?

2

u/jamiexscottt 23h ago

Nope. I’ve worked in the paint section in B&Q for 4 years so I know a thing or two lol

0

u/Superdudeo 23h ago

Thanks. Any idea of best filler to use for some small bits? Would obviously need to be an external filler

-1

u/jamiexscottt 22h ago

Polyfilla make an exterior filler. You could use it and then sand it if you need to. Put the filler on before sealing it tho

0

u/haphazard_chore 22h ago

That poly filler is shit. This is clearly a job for a concrete mix. You can buy a very fine pre-mad mix from screwfix, Bostic general purpose mortar for masonry repair, that holds bloody solid. Living in an exposed costal region, I can confirm it’s WAY better than poly filler

2

u/Superdudeo 22h ago

This stuff?

https://www.screwfix.com/p/bostik-general-purpose-mortar-grey-5kg/36857?tc=KB4&gclsrc=aw.ds&gad_source=1&gbraid=0AAAAAD8IdPxEx1C_cwgGf_MW4KzkidZhM&gclid=Cj0KCQiAvbm7BhC5ARIsAFjwNHuOhJ1zCMzKP6M858B6XGVk07PQajP4xDQ5Kf5BiFyyDaMl0M8Ioo0aAgcIEALw_wcB

1

u/haphazard_chore 22h ago

Yes, that’s it. It’s super solid. I’ve previously had issues with my own cement mixes because the sand is not fine enough and the weather gets in. A friend did work on my house using that poly filler and the weather got behind that too forcing me to scrape it out and replace.

1

u/Superdudeo 22h ago

When I open this one, does it dry out quickly like pre-made filler or can I come back to it a week or month later?

1

u/haphazard_chore 22h ago

You can use it over time. It’s adding water that activates it. Don’t mix up more than is needed as it does go off fairly quickly.

1

u/rmas1974 22h ago

Concrete contains aggregate and would be too rough for minor fixes needed on a basically sound surface. For a finer finish, I agree with others that a cement based exterior filler such as the exterior Polyfilla product is the way to go. If there are larger fixes, a cement / building sand mortar could be used.

1

u/haphazard_chore 22h ago

Nope. That specific mix is really fine and it has held up extremely well even without me having painted over it all season. It’s rock solid! In fact there’s places I rushed and did not smooth out, thinking it wouldn’t matter and yet even points sticking out are like rock. Something I did not expect.

1

u/rmas1974 22h ago

You don’t get points sticking out if you apply exterior Polyfilla well. It is cement based so you do need to get it into the right shape before it dries because it is difficult to sand when it dries out.

1

u/haphazard_chore 22h ago

The issue I had with the pollyfiller is that the weather got to it and it degraded quickly, leaving me to have to dig it out and replace. Maybe in less exposed areas it’ll last longer, but why bother when the bostic mix is solid as hell

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1

u/Lonely-Speed9943 8h ago

Probably not but completely wrong advice for Bath stone but exactly what you'd expect from b&q advisors when asking about 100+ year old houses.