paint bubbling within 5 mins of application

tom1ie

ok this is gonna be a long one:
im trying to paint a room. 2 of the internal walls are solid walls. the external wall is solid but ive put 50mm plasterboard insulation on it. The other wall with the chimney breast, i have also put 50mm insulated plasterboard in the alcoves.
I reskimmed the chimney breast yesterday (friday).
I am attempting to paint all the walls with dulux easycare matt emulsion, water based. The paint goes on just fine on the walls with the insulated plasterboard, but on the solid walls the paint starts bubbling within 5 mins. In some spots when i try to paint over the bubbling, the paint lifts back onto the roller!
Before i started painting we washed the walls in sugar soap, following the instructions on the bottle. We then washed that off with clean water, twice. The walls were then left to dry for about a week and a half.
To complicate things further i experienced this bubbling effect on the ceiling with the first coat of pure brilliant white, albeit in a small area 5"x5". The paint eventually seemed to "suck" back in, so i hit it with a second coat and it seems alright. you can only see bubbling if you look really hard.
So ive come to a conclusion:
it cant be the paint, as the paint isnt bubbling on the plasterboard walls.
I have left it to dry overnight, so tomorrow im gonna second coat the plasterboard walls, sand the bubbled parts of the solid walls, and attempt to second coat them.
should i do this?
i've asked in a couple of paint shops and they weren't sure what to do.
A friends brother recommended i sand the bubbled area and wait until monday, go to dulux in killinarden, and buy a primer off them. paint this on, let it dry and then paint over it.
Any thoughts?

TheRiverman

Is the room well ventilated when you are painting?.I would open as many doors and windows as possible and then paint a small area on one of the walls that is bubbling and see what happens.I have two rooms in my house that are on the west facing gable end and unless I have a lot of ventilation when painting them bubbles appear.Like you I use water based emulsion.
I don't know what the "scientific" reason for bubbling is and it might not work for you,but having lots of fresh air in the room helps to eliminate it for me.

tom1ie

TheRiverman wrote: »

Is the room well ventilated when you are painting?.I would open as many doors and windows as possible and then paint a small area on one of the walls that is bubbling and see what happens.I have two rooms in my house that are on the west facing gable end and unless I have a lot of ventilation when painting them bubbles appear.Like you I use water based emulsion.
I don't know what the "scientific" reason for bubbling is and it might not work for you,but having lots of fresh air in the room helps to eliminate it for me.

I had the window open while painting so there was plenty of fresh air as well. Just to add I painted the walls 5 years ago with emulsion (again dulux matt, not the easycare though) without any bubbling problems.

tom1ie

Also just to add when I put the sugar soap on the solid walls it caused the original paint to bubble in some areas.

ouxbbkqtswdfaw

tom, I would try painting an area with oil based white undercoat, diluted a little with white spirit if necessary , to make it spreadable. Then cover with ordinary matt emulsion.

tom1ie

mhy4qd751kxew9 wrote: »

tom, I would try painting an area with oil based white undercoat, diluted a little with white spirit if necessary , to make it spreadable. Then cover with ordinary matt emulsion.

Ok. Sounds like a plan. But would the emulsion paint straight over that? Would I not need to prime it then?

ouxbbkqtswdfaw

No. Paint the emulsion on over the dry undercoat. Put the undercoat on with a 6 inch emulsion roller. I don't know about easycare, but I would use ordinary matt white. If you want white soft sheen put it on over the plain matt.

Mango Joe

Just to add in case it helps anyone (or even me if someone does have a notion) my house is a nightmare for this.

Its an 80s bungalow - You carefully apply a coat of paint - everything looks perfect BUT after 4-5 minutes loads of little bubbles gradually appear in the original paint.

I can only suppose the solvent in the paint is soaking through to the plaster and then some chemical reaction occurs which releases a gas which 'inflates' a perfect little dome of about .5-1cms in diameter.

Its the greatest pain in the hole ever :mad: