bubbles in paint when painting ceiling HELP

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first painted this ceiling 6 years ago and when paint dryed it bubbled in a few places, so im finally painting it again and done a test patch, first i rubed the bubbles down they look like craters, cleaned with suger soap then painted with dulex pure brillent white matt and low and behold the bubbles are back. i have read somtheing about painting matt onto silk could this be it???

any ideas would be great
 
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If you ever use sugar soap you should always wash with clean water to remove the residue, painting matt over silk without the correct prep can cause the paint to blister, how many of these bubbles do you have.

Dec
 
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we have an open plan living dinning area, and the blisters appear in only a few places in the livining room were i think smoke from candels or from the fire before i removed it has caused greasy areas on the ceiling. i read some were about using a trade primer before painting so it takes better??
 
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Scrape back the blisters and apply a thinned oil based undercoat, when dry do any filling that is required and again when dry sand them smooth, then apply a thinned coat of emulsion over the filler, you should then be ok to continue.

Dec
 
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