Bond-it Coat - Chalky texture!?

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chappelln

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Hi All,

I put a 5mm layer of Thistle Bond-It over an Artex Ceiling a few days ago and I've noticed that there a few patches appearing which are a much lighter beige colour and has a chalky texture when touched.

I prepared the ceiling by scrapping the worst of the Artex off, coated the ceiling with a 50/50 PVA mix then the next day went over it with a 5mm layer of Bond-It.

Anyone come across this before? or have any advice before I proceed to Skim!?

Many Thanks
 
Hi,

Thanks for your replys, I should have said upto 5mm thick on average! the main bulk is about 3mm! theres about 4 areas were is has dried alot lighter and when rubbed its like chalk, just wondered if anyone would be kind enough to give me an insight to what may have caused it, the rest of the ceiling has turned out great.
 
So your skim coat has gone chalky in odd places. Do you think just maybe it is were the skim is a little thin over the artex. And also artex can sometimes turn into a fluid state again and mix the skim am thinking the pva may have cause this with the artex. If your skim was thin in places it will dry out quick and when you trowel the whole ceiling these high spots will go a little chalky because they are already dry. Solution give the ceiling a pissed down coat of pva this will seal it ready for painting.
 
did you pva the ceiling before you applied the bonding? and did you get all of it? as in... did you miss the odd patch, the bondings gone on a bit thinly, dried out too quick? maybe? or did you just slap bonding straight on the ceiling with no pva?
 
whooooaaaaa hosss....

henry, he aint skimmed it yet, hes just bonded it out... one thing at a time...

did you pva the ceiling first?

youll need more than a p'ss wet coat of pva before you skim it if its been left to dry out for a few days.... as in 2 coats at about 3:1

and you shouldnt pva plaster prior to painting... especially if its silk, it reacts... always mist coat, then top coats...
stabilizing solution doesnt react as far as i know...
 
Chris W said:
did you pva the ceiling before you applied the bonding? and did you get all of it? as in... did you miss the odd patch, the bondings gone on a bit thinly, dried out too quick? maybe? or did you just slap bonding straight on the ceiling with no pva?
Click to expand...

Looks that way eh , bondings dried before it's set , needs stabilising
 
Yeah I PVA'd with a 50/50 mix, I put food die in the PVA as to avoid missing patches. Should I try and knock off these chalky patches and re-fill, or give it a couple of 3:1 mixes of PVA prior to skimming?

I did think of overboarding......but the cons out way'ed the pro's on this occassion.
 
I see thistle bonding not wicks Bonding. If you cannot skim it then board and skim. Whent off before the starting gun there LOL.
 
I dont reckon it was 'gone-off' before the starting gun. It was on the ceiling within 20 mins after being mixed and it went on wet.

Is Wickes Bonding better then?
 
if the chalky patches are sound , i would give it 2 coats of pva and skim it , if the patches are loose , dig them out , re pva and bond patches , then 2 coats of pva and skim
 
No mate I was to quick on my answer hence starting gun. I ment to say wicks bonding agent it is a glue sorry mate my fault. Anyway if it's on and ready to be skimmed it must be pretty dry by now so you will have some Suction. Dont worry about the chalky stuff mate it may well be a bit of distemper come through.
Who to say how the artex was put on and over what back ground. If it were me I would give it a coat of pva and make my mix a little wetter then normal this will help it spread a little better for you , double up and watch how much water you use when skimming up. In the event of a few blebs which can happen pop them when you nearly trowel off. Am not trying teach you how to suck eggs mate just a few things Ive learnt along the trail.
 
i wouldent of bonded it in the 1st place,not a ceiling,may just be a bit to much weight after skimming it,could fall off,may not do,but i wouldent do it,i would of(if no possibility of overboarding it)just took any high spots off,skimmed it with a thickiish coat,let it go a bit,then skimmed it normally:RpS_thumbup:
 
really chris,dident know that,
but you are still adding more weight,just my opinion though,i wouldent do it:RpS_thumbsup:
 
I dont think a tight coat of bonding will cause the ceiling to come down , if we dont overboard , we will always put a tight bonding coat 1st , i think it gives a better finish , but we set the same day , not keen on scraping artex back anymore with the threat of Asbestos :RpS_thumbdn:
 
The reason for bonding the ceiling first was; A friend very kindly skimmed one of our ceilings (Thick coat first) but becasue the Artex is very deep in place's! Some shadows of the Artex still show through the skimmed ceilings, hence the thought of a thickish bonding coat so when I skim I will be skimming on a flat surface and would avoid the pitfall of having some areas of the old Artex ceiling show through again.


I applyied a 3-5mm bonding coat which has just lightly covered the Artex. I did think of a thick coat of Skim followed by a finishing coat but was always told not to apply more than 3mm thickness per skim coat.

Henry your tip are very useful, always glad to here other people hints/tips.
 
craigw said:
really chris,dident know that,
but you are still adding more weight,just my opinion though,i wouldent do it:RpS_thumbsup:
Click to expand...

nah your not though mate, i did one the other night....
you know when its stipple, you can pretty much flatten it with a scraper and give it two coats of skim, let the first one pull right in, then mix again and top it, no worries...

when you got a fan type pattern, it just doesnt scrape the same, and i find youve gotta lay your first coat on thick (i always make sure my first coat covers the pattern or youre always gonna see it) so instead of a thick coat of skim, use a thin coat of bonding, same thickness but bondings lighter... less strain on the artex innit.... then just one coat of skim if you catch it right...

i did a 50/50 bonding skim mix the other night for the first coat, let that hazel off and just had to get on the skim when the odd dark spot appeared... touch too early but i was runnin out of time..
still got it loverly though..
bondings ideal cos it sticks like sh't to a blanket but it takes a little longer to pull in / hazel off than just straight finish, well, it doesnt really hazel off as such but you get the idea... wait till its ready...

bag of bondings nearly a 1/3rd bigger than a bag of skim but theyre both 25kg...
 
so your sayings it was a scimmed ceiling then? not an artex ceiling at the point of you applying bonding?

If so youve gone way over the top at most it would have needed 2 coats of new scim or poss 1 fela
 
yeeeeeesssss and nowhere in the thread does he mention bonding over an existing skimmed ceiling...

what he said was..

someone 2 coated ONE of his artex ceilings... and it showed the pattern..

so (and fair point) he's opted to BOND the next one out prior to skimming...

see

mushrooms...
:RpS_laugh:
 
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