Eh...serious ah...got people want my daban hi nu ver ka + premium set ?

online sellers, there are plenty in Trade Zone, you can try finding in Facebook too
1:3 ratio is fine, what I'm guessing is you one shot spray too thick layer, the part ended 'soak' in thinner
you should spray a few thin coats, allowing time to dry between each coat

correct me if I am wrong, but that is lacquer thinner?

if yes, B or not, it will be bad against ABS type plastic (hence new MG now highlight that it uses PS plastic frame)

also, do not use self-leveling thinner on ABS plastic, Self leveling means it is premixed with retarder. This will result slower drying time for the lacquer thinner and paint. This is good since it allows the paint to self-level before drying. This is bad for ABS plastic since the plastic is exposed to wet thinner longer.
Can I ask what you did?

1. Spray continuously without letting the earlier coat dry (cause it looks like the layer is thick)

or

2. You mist the first coat, then let the first coat dries. then apply another. (the concept is rather to cover everything with one pass, you complete the work with 2 or 3 thinner coats)

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Ratio I normally used is 1:2, whether for primer or paints. Sorry for your loss though, that really is a ver nice kit....

Anyway, regarding daban MG Nu Ka, here's my wip so far, remaining the much dreaded fin funnels...



Great kit, snap fitting perfect, plastic feels like ori, just need some trimming here and there, no big issues, recommended

Can't remember them, I'm working rite now, so I can only let u know tomolo morning, pai seh....

Regarding washing the parts, it is recommended to wash them b4 painting, but I'm the lazy type who didn't
Also, I seldom prime my kits, unless I'm changing its colors from darker type to lighter ones.