nippon matex is basic paint (cheap stuff) for building construction where contractors just wanna get the whole building painted with lowest cost possible

nippon easy wash and the more expensive one come with different properties of its own, but in my opinion, easy wash is not really easy to wash due to its matt finish

i have used jotun easy wash in my room before, but because it is matt finishing, some time the dirt still get stucked on the rough surface, if you get those with sheen or semi gloss finish then it is easier to wash

for the painting sequence, follow the step below:
1. putty/skim coat or repair surfaces
2. apply wall sealer
3. apply 1st layer of top coat
4. apply 2nd layer of top coat

step 1 and 2 has a longer dry time, putty or skim coat can take more than half a day to dry depends on your mixture and environment

for wall sealer and top coat, follow the manufacturer instructions to see the minimum time you need to wait between coat, personally i will do step 1, wait for 1 day, then the next day i do step 2, wait for another day, then finally step 3 and 4 around 4-6 hours apart from each other

if the wall already has top coat and in good condition (no patching with putty or visible concrete) then you can just clean the wall and repaint with top coat

sealer only needed for sealing exposed concrete and plaster/putty, you can use your leftover sealer as base coat to cover your previous color especially when changing from darker to lighter color