I’m polish expat based in Thailand. I’m at the finish stage of building a 150 m2 small house. Basically all work left to complete the unit is just painting job which is turning out to be a nightmare because of uneven plaster with very bumpy skim coat all over interior and exterior walls.
Here is few important points to illustrate the problem:
Poorly plastered walls. 30-100 cm large and 2-6 mm deep Indentations as well as smaller bumps all over the surface. I think this is not much visible and would not be a problem but I’m guessing that it raises a problem for the skim coat to be applied as the substrate is too much uneven.
Exterior surfaces looks pretty much acceptable in a daylight but terrible at night when flushed with lights. There is a sweep at the top of the walls wrapping around whole house. The sweep has several LED down lights which highlight the bumpy skim coat very much.
The skim coat product is Australian Parex Lanko 103 considered in Thailand to be one of best quality product available. Reference: www.parexgroup.com.my/images/product/Lanko%20103.pdf
Skim coat is painted with a premium quality Elastomeric paint (eggshell).
2 different tradesman failed to apply the skim coat. After that I decided to learn and complete the job on my own. I have spent weeks practicing, watched and tried many tutorials and advised techniques. I can’t get satisfactory results when wall get lights at night.
The short story is that all looks pretty good in a day but turns into terrible mess when highlighted at night.
I’m pretty disappointed at this point but don’t want to give up. After so much effort giving up would just break me up completely.
Please advise or guide me through. Feel free to ask for additional info or images.
UPDATE: After posting this I have got an important addition and more direct question that may lead to a solution.
I have realized that one thing making the job difficult is the fact that I can't tell if the surface is smooth enough unless I paint it over with the final coat.
I have even tried applying final coat of mud followed by sanding it at night with lights on but even than I can't really say if all is good enough.
The skim coat is very flat white and also covered with dust. Whats more I see gray plaster in small points where the mud layer is very thin which makes an illusion of uneven surface...
All bad stuff is just showing up after I paint it over with a final coat of paint. Than, at this stage is to late to make any fixes as there is a need to sand out the paint along with the excess of mud in places where I see the bumps. The paint is to elastic, rips a part and just makes all more difficult.
So, my question: Is there perhaps some type of paint that I could use as a tester? I imagine it would have to be easy to sand and have some gloss to cast shadow of all bad places to be fixed.