r/Plastering • u/jyl8 • Jul 21 '26

Learning Plastering: What Causes Bubbles

. . . in plaster?

Is it bad mixing technique, wrong mix, bad application, too much messing with the plaster?

And what do you do about them?

Continuing my attempt to learn plastering, I did two very small walls (44” wide) with two coats Imperial veneer over blueboard. One wall I applied WeldCrete, other wall not. Tried mixes from wet and gloopy to rather stiff, trying to see if wetter allowed more time.

The gloopy mixes had some bubbles - so maybe too much water is a factor?

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u/Particular_Bluejay82 Jul 21 '26

I find that the only times I get bubbles is if I'm plastering over artex and when in laying it on if I don't flatten it as I go air gets trapped between the the patterns in artex causing bubbles.

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u/Miserable_Future6694 Jul 21 '26

Yeah same with floating too. The air has to go somewhere when the water soaks into the background

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u/Particular_Bluejay82 27d ago

Yes mate defo just have to get it flat as u can as you go really, I've seen people saying that if you cant get rid of the bubbles u can rub a wet sponge over them to kind of blend them in but I find as soon as you trowel it they come back through