How to fix cracks on the wall

S

simonksl26

Hi All,

I have a long crack in the bathroom wall running across on my IP apartment (http://i43.tinypic.com/5vzn87.jpg). The wall is probably plaster. I am thinking of DIY. I will probably need to fill the cracks and then repaint it. Can anyone give some pointers to the questions I have?

1. What fillers would you use? I have this : http://www.bunnings.com.au/uni-pro-500g-multi-purpose-filler_p1210281

2. What type/brand of paint do you recommend? From my research, many people say to use the semi-gloss oil-based paint with mould resistance. But I went to Paintspot and the guy recommends an undercoat and then a water-based paint with mould resistant (http://www.bunnings.com.au/taubmans-easycoat-kitchen-and-bathroom-2l-white-interior-paint_p1543970). What do you think? The trouble is I am not sure whether the paint on my wall is water or oil based. :(

3. Any recommendation what type of brush I would need? I am thinking of getting the Uni-Pro brush and roller.

Brush 63mm : http://www.unipro.com.au/applicatio...e=flypage.tpl&product_id=1015&category_id=144

Roller Sleeve : http://www.unipro.com.au/applicatio...ge=flypage.tpl&product_id=1265&category_id=99

As you can tell from my questions, I am quite a noob with this paint project... but then not necessary a bad pair of hands :p
 
Looks like either some movement in building or a few screws/glue has given way.
I think if you fill and sand it will appear again , just my thought but it looks like
a sheet join where its laid over with tape has cracked.

Bathroom , how old is the place, if pre 1980 could have asbestos sheeting.
I would rescrew onto framework before trying to fill in the crack.
 
I use cornice cement as opposed to fillers. Cheaper and works better in my opinion.

Either the bostick pre mix cornice cement, or if doing a large sections, then the 2.5kg powder of cornice cement.

http://www.bostik.com.au/constructi...gue-sheet-28827-cornice_cement-m-106-g-0.html
http://www.bunnings.com.au/gyprock-2-5kg-cornice-cement_p0730786

I would sand and scrap off any flaking paint
Then fill in with cornice cement
Sand back lightly for a smooth finish.
Undercoat the small section and then top coat if i can get away with it.

For bathrooms, my preference is to the use waterbased semi gloss paint. I also add a bit of Mould Killer (http://www.paintaccess.com.au/products/vc175-mould-killer?gclid=CMzW3_vHyroCFSpIpgodzy8AXQ) to all my paints, not sure if thats a good or bad thing. But im just a diy'er. A few of the more experienced painting guys could probably steer you in the right direction here.
 
If the wall is a sheet product as it appears to be then it will crack again if you don't tape it and treat it as a butt joint.

Tools
 
simonksl26 said:
Hi All,

I have a long crack in the bathroom wall running across on my IP apartment (http://i43.tinypic.com/5vzn87.jpg). The wall is probably plaster. I am thinking of DIY. I will probably need to fill the cracks and then repaint it. Can anyone give some pointers to the questions I have?

1. What fillers would you use? I have this : http://www.bunnings.com.au/uni-pro-500g-multi-purpose-filler_p1210281

2. What type/brand of paint do you recommend? From my research, many people say to use the semi-gloss oil-based paint with mould resistance. But I went to Paintspot and the guy recommends an undercoat and then a water-based paint with mould resistant (http://www.bunnings.com.au/taubmans-easycoat-kitchen-and-bathroom-2l-white-interior-paint_p1543970). What do you think? The trouble is I am not sure whether the paint on my wall is water or oil based. :(

3. Any recommendation what type of brush I would need? I am thinking of getting the Uni-Pro brush and roller.

Brush 63mm : http://www.unipro.com.au/applicatio...e=flypage.tpl&product_id=1015&category_id=144

Roller Sleeve : http://www.unipro.com.au/applicatio...ge=flypage.tpl&product_id=1265&category_id=99

As you can tell from my questions, I am quite a noob with this paint project... but then not necessary a bad pair of hands :p
Click to expand...

It's a crack in your sheet join.

Just get a plaster in to fix it back and re-top it, much easier.

As far as that paint, whatever you do, don't put a semi gloss under a low sheen wall colour. It will show up underneath, you should never get a gloss under a flatter wall colour, it will always show up underneath as a different texture.

Paint it with a roller, not a brush, and the whole wall. Once you've had it repaired, just roll the raw top coat with a sealer/undercoat, then roll the whole wall twice with your final colour.
 
On this, what product have people found works longest for concrete walls? I'm guessing a silicone based filler?
 
Jacque said:
On this, what product have people found works longest for concrete walls? I'm guessing a silicone based filler?
Click to expand...


For solid plaster?

Your better off just trying to caulk a crack with no-more-gaps.

Your other option is getting the whole wall re-rendered essentially.
 
MRCCON said:
For solid plaster?

Your better off just trying to caulk a crack with no-more-gaps.

Your other option is getting the whole wall re-rendered essentially.
Click to expand...

Any crack that is caulked will stand out like the proverbial. You can tape and stop up over solid plastered walls as well.

Tools
 
The uni pro brushes are perfect,you can even use the same brush for the gloss work.
The crack in the wall just needs the old tape taken out and retaped and topped using a premixed base coat plaster.You can buy that from a plaster shop or bunnings.Powder form is cheaper and does dry quicker just not as convenient.

If you aren't sure if your paint is oil based or acrylic,use some mentholated spirits test to see if the paint melts,

If its acrylic I would just use an extra coat (Low sheen) on the finished plaster,save you buying undercoat.
 
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