Paint noob Vs plaster wall

[bobbavet]

I over painted a room that was a matte purple acrylic (previous house owners). I sanded, washed, undercoated and final coated with out probs. Was pretty proud of myself. lols

I am now having trouble with a painting 2nd bedroom. It was originally painted the same as my 1st bedroom (matte purple).
My wife 8 years ago decided to paint over that matte acrylic with a high sheen acrylic. No under coat or prep. Just strait over it. lol
It would have taken many coats to get out the old purple and I think that thickness of paint has contributed to the situation.
Any ways, there seems to have been a reaction and paint has cracks and peels right down to what appears to be the a pink sealer on the plasterboard.
The plasterboard by the way is the plaster fiberglass strand type. I tried stripping with heat gun, quickly got board with the pace and have now used stripper on the walls.

I have searched the forums and think I have an Idea where to go from here. Any tips appreciated. My plan is:

1 - Light sand the walls to remove stripper and paint residue. Taking note of spots and filling along the way.
I am a bit concerned about some fiberglass fibers sticking out. Will they just sand down? Should I skim coat then prime/seal OR prime/seal then skimcoat?

2 - Wash down the walls with sugar soap.

3 - 2 coats of a oil primer emulsion 60/40 to seal the plasterboard. I gather water based sealer products are not to be trusted with this type of plaster board. (though a quick solution would be handy. lol)
I have seen and Dulux oil based all in one sealer primers at Bunnings. They say you can go straight over with water acrylic. To good to be true?

4 - A full coat of oil based primer.

5 - A coat of an acrylic primer.

6 - 2 top coats of final acrylic

Thankyou to every and anyone involved in the forum.

cheers Bob

[rob streeper]

Bob,

Sounds like a mess. I've found that removing the old wall panels and replacing them with new is a more efficient (time and money) method of dealing with severely compromised plasterboard/drywall. You do have an incompatibility problem with the coatings that are in place. Sealing might work but you would likely still have a visually unappealing result. In the alternative you could try skim coating the entire surface with drywall compound but I'm not optimistic.

Cheers,
Rob

[bobbavet]

Bob,

Sounds like a mess. I've found that removing the old wall panels and replacing them with new is a more efficient (time and money) method of dealing with severely compromised plasterboard/drywall. You do have an incompatibility problem with the coatings that are in place. Sealing might work but you would likely still have a visually unappealing result. In the alternative you could try skim coating the entire surface with drywall compound but I'm not optimistic.

Cheers,
Rob


Rob, thanks for your reply. I believe your right and I should have listened to my brother as well. lols
This is going to take too much time effort and suck up money. Money better spent to start with a blank canvas and not have to deal with previous peoples inadequate work.
Seriously, the previous owners were "house flippers" and have found numerous dodgy garbage around the house. The nail filling in the previous room was not even sanded proper before painting.
Confident I could put up new board and new floor trim. I am concerned at how to keep the ceiling arctrave intact when removing old plaster board.
I am considering geting a plaster tradesmen to do it though, want it done proper.

Cheers