Sadly, there's still no MG IBO kits..

I doubt it will melt.. but discoloration will happen very quickly.. if you use gundam markers on them, those will fade first..

Hmm, is it because the polycaps got weakened rather than the plastic itself melt?

Melt might not be the right word to describe it... it more like degradation due to the uv rays from the sun. But that will happen after the discolouration... After the colour goes away, then the plastic hardens, then slowly cracks and shatters..

That's why they say hardcore Otakus are one of the richest group of people in the world...

Buying from Japan is much more expensive unless you fly to Japan yourself. It's the transportation costs that might kill you despite the cheaper base cost.

If you're from West Malaysia, the shopee sellers often gives free shipping or highly discounted shipping costs so it's relatively acceptable. But if you're in Sabah or Sarawak, transportation costs from the West can often be very expensive too (I have seen rm40++ for shipping) and sometimes you can get better prices off Taobao.