![]() ![]() I'm sure the Thistle Bondit mentioned above is great stuff, but you should get away with PVA if you want to go that way. Followed off with a good wash down using sugar soap. On really bad walls (I think 60's-70's paste must be particularly yucky stuff), I've had to spray a little water on to the walls, allow it to soak into the paste, and then scrape them down using a squeegee. ![]() I have found that any traces of old wall paper paste can be an absolute swine as it re-activates when anything water-based is applied to it - emulsion, PVA, etc - and it expands and can make your job a mess.Ĭertainly before painting, you'll have to thoroughly remove all traces - you might get away with it if PVA-ing instead, but it's a risk. However, getting this right will require a certain level of skill, as well as good timing.I guess you've done the job now? If so, what did you do,and how did it go? Take your time and wait for the plaster to start going off before removing them. If bubbles or blisters appear, don’t rush into dealing with them. So, you should make sure your plaster is mixed correctly, also use a good trowel technique and don’t overwork your first coat. There are several reasons why plaster will blister and bubble. This should eliminate any issues and give a high-quality decorated finish. At this point you can use a fine grit sandpaper (120-180) and some fine filler. However, it will also highlight these small imperfections. This will be needed prior to painting anyway. If your wall is completely dry and you still see small imperfections, you should give it a mist coat 50/50 water and emulsion. This will mean that the plaster is still workable, which will enable you to smooth over the popped blisters. If they don’t improve, then you should wait for it to firm up before running your trowel over the plaster and the blisters. At this point, you might notice that the blisters improve. You should focus on filling hollows and trowel marks. If you notice blisters in the second coat, you should leave them and continue with the trowelling. This should make it possible to deal with them as this is the flattening stage. So, it’s important to leave the 1 st coat until it is almost set before you move onto the 2 nd coat. Should you apply the second coat too soon, then the blisters will come through. They can then be held back by allowing the plaster to set a little more. If you notice bubbles while applying the first coat, you should ignore them until the time is right, as you can make them worse. However, the aim is to deal with them at the right time. When you see bubbles while plastering, you might feel tempted to pop them or go over them with a trowel immediately. How Do You Repair Blisters in Plaster Walls? This should then prevent bubbling from occurring. If bubbling is still a problem, make sure the plaster is flat and almost set, before using a heavy trowel action with a small amount of water. Then, when you apply the second coat, keep the mix thin. Once the wall has been covered, you should leave it alone. One general rule of thumb is to cover around 4sq/m at a time. So, apply the first coat as quickly as possible and work it flat. Too often, people go back to the first coat too soon. You should apply the first coat and leave it alone until it stiffens. This is natural, as you’ll want to achieve a perfectly smooth finish, but it is not necessary. This means that when you apply the first coat, you spend too much time trowelling it. It’s possible that you might also be over-trowelling. If you add too much water, this can also cause bubbling, so you should ensure your mix is the correct consistency. If it is too thick, this can cause air to get trapped. This reduces the amount of air in the mix and will create a smoother mixture.įurthermore, the mix should be the right consistency. The correct way is to use a circular motion, while leaving the paddle in the plaster while stirring. It’s common for people to mix plaster by lifting the paddle mixer in and out of the mix during mixing.īy lifting it in and out of the plaster, it enables air to enter the mix, and this can cause the plaster to bubble. If air in the mix is the cause of the problem, then your mixing technique might need to change. ![]()
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