For new condo, do I need to apply sealer or anything else before painting? Am thinking of Nippon Easy Wash for interior walls.

Also thinking of painting plaster ceiling myself, is painting Matex directly on it enough? Or they have to be primed/sealed first as well?

Hi all, I am planning to DIY paint my new house. I have some questions and sifus welcome to correct me if I'm wrong or give any additional tips if any.

Paint:
1) Ceiling: 2 coat of Nippon Perfect White
2) White walls: 2 coat of Nippon Perfect White
3) Coloured walls: 2 coat of Nippon Eash Wash
4) Hacked runs on walls: 1 or 2 coat of Nippon 5400 Sealer before top coat

Planning:
1) Sand down uneven surface using 100 grit sandpaper
2) Wipe off dust using damp cloth
3) Seal hacked runs
4) Paint ceiling first
5) Paint wall

Questions:
1) For 2 coats of Nippon Perfect White, is it neccessary since existing is developer's Matex/Maxilite? Or better to paint 1 coat of Matex and then 1 coat of Perfect White to save on some cost?
2) Can I paint at night? Thinking of going to paint at night after work. If wait weekends to paint, might take few weeks to finish. But my concern is that panting at night might be not good for the paint (ambient temperature cause paint shrinkage? Insects?)
3) After wiping off dust using damp cloth, when can I paint? After 1-2 hours to ensure the wall is dry enough?
4) I might be pouring small amount amount of paint into an empty 18L paint bucket with paint grit and dip my roller straight from the bucket. Do I need to stir Nippon Perfect White before pouring?
5) How do I store the paint and roller/brush for tomorrow or next weekend use?

2) What happens if I paint during raining season? The paint will crack? What if it starts to rain unexpectedly when I'm in the middle of painting or just right after painting?

4) But there's advice to paint directly from pail, to reduce the need of pouring many times into paint tray if painting large surface like ceiling. Also mentioned that there's paint grid in the pail (something like a mesh) which I will roll onto to remove excess and even out the paint on the roller (same purpose as paint trays).

5) So let's say I managed to paint only 1 layer of paint tonight and wish to continue 2nd layer tomorrow night or next weekend, the roller has to be washed/changed new? Saw some tips to seal it in ziplock bag, or store inside paint bucket and covered tightly, but I'm not sure is this proper way.

6) If my wall requires 1.5 litre of coloured paint, then I should be buying 2 cans of 1 litre right? But will the colours be exactly same? Or it's better to buy 5 litre directly to prevent different colour? Saw some facebook post bought 2 cans with same code, same seller, same day but different tone.

Alright thanks sifu sifu! Now have more info on painting, will plan accordingly. Thanks again for valuable tips!

Hi all painting sifus, I just painted 1 layer of light blue and noticed this spot (hopefully you guys can spot this too in the photo). I think the developer patched this area since texture is different, afraid will have uneven tone later, I applied 1 layer of sealer at this spot. But after painting the colour, this spot showinf uneven tone
not sure is it because of my sealer? How do I rectify this?



This post has been edited by idkihavenoidealol: Jun 15 2022, 08:13 PM

Yup, gone after 2nd layer. Got panicked haha