paint cracking - how to get good adheasion?

[chrispollin]

hi,

all of our house has been painted with magnolia, and in another room, when we tried to paint on top of it, the ourcome wasnt great, areas have peeled off and cracked.

The room that we are now going to start on has also some odd paint defects.

The roof has a patch where the paint has taken on a cracked look - firist pic

and in the corners and round the door and window frame the paint has cracked and started to peel.

Whats the best course of action here or best paint to put on top of it to stop the new coat going the same way.?

 

[emilybronte]

Sand back to bare plaster in affected areas, apply two coats of Zinsser Gardz, allow to dry, then proceed with painting or papering as planned.

 

[TheDec]

Etching primer!! Are you in anyway suggesting a mordant solution?

Dec

 

[sparkwright]

I have found a guy who is a Genius on all these sort of problems at www.**********.co.uk who can give you advice. He is very willing to solve all your decorating problems for free and he can talk you through it. I called him with a recurring decorating problem and it sorted out.

It's you, isn't it?

 

[oldgreymouse]

chrispollin, I would like to ask if you had washed down the walls with sugar soap before you started painting?

Quite often the crackle glaze effect you had in your new coat of paint comes from applying 2 differing types of paint that do not like each other so to speak, it can also be a contaminant on the wall such as a cleaning fluid,or even something like PVA glue.

I once had a call from a new customer who was trying to cover a brown stain on the ceiling for two years with some latex glue she bought from the art shop. It was her third pot and the art shop advised she get help. I tightened up the rad in the bathroom above, before using zinsser 123 and a couple of coats of Dulux to sort it.

If you are planning to do any sort of continuous decorating over the next few months, then maybe it would be wise to invest in some zinsser gardz as Emily has said. It will give you a good base coat to start with and can be used to seal over a multitude of problems you may get with paint.

 

[chrispollin]

hi there, ok a bit of history here,

before i bought the house, the previous owners about 7-9 years ago had every wall and ceiling skimmed. They then painted it. I am not sure of the paint they used or what if any preparation they had carried out. so im working a bit blind.

The room in the picture was been untouched since I moved in.

The kitchen was far worse with cracking and peeling paint, so I rubbed down as best I could and painted over with a dilute emulsion then a few colour coats.

This was less than sucessful and the same has happened again, especially where the new paint meets the edge of the old.

So I'm working a bit blind as to what or whats not been done to get it in this state.

re "zinsser 123" can this be bought from any diy type store - just Ive not seen it before?

Thanks

 

[emilybronte]

re "zinsser 123" can this be bought from any diy type store - just Ive not seen it before?

Thanks

No, it's not generally available in the big DIY stores like B & Q - I get it in a decorator's centre. It's not cheap (about £30 inc VAT for a 2.5 litre tin), it smells strongly until dry and you need methylated spirits to clean the brush/roller. But it's good stuff - it sticks to anything (even previously waxed surfaces!) and anything sticks it it!

The Gardz is good, too - but again, you won't get it in B & Q!

 

[oldgreymouse]

Hi again chrispollin,

Zinsser is best bought over the internet, the prices tend to stack up if you use your local trade centres and order through them as they need to make a profit.
One company I use is http://www.trade1st.co.uk/productdetail/Zinsser/718.aspx
They should be able to supply your needs, but there are others if you shop around.

I have to say as a trade dec, you may think prices for products used in the trade are high, but if you are employed to see a job done right, it is very handy to nip out to the van and grab a tin of something that works, rather than having to waste time and expense driving round mid-job trying to find something that might just do ! If you know what I mean.

 

[dcdec]

I think you guys are getting your zinnser products muddled up. 123 is water clean up, bin is meths, and as said from the start gardz is a better option or maybe peel stop.
Could be any number of reasons why this defect has occured.
Trade 1st are very good.

 

[oldgreymouse]

Thanks for that dcdec, but on balance as the problem is only a an issue with getting matt emulsion,to coat over a previous matt emulsion and new plaster, I would generally have gone for the 123 first, and not bin as no oil paint is involved.
Gardz is another option but again this stuff tackles similar things so I guess either will do being water based.