Actually resin kit needs quite an amount more teention than plastic injection kit.
1, injection kit, where the mold is metal, hard n durable, will have more consistency. where else resin, its mold is made of silicon rubber: soft n not so durable.
In the past, resins r usually cast by individual sculpter, by hand. More of a cottage industry. Hence it got it's name: GK kit, which means Garage kit.
Even now, where in china, there r factories that use modified machines to cast resin, still using silicon rubber mold, the onsistency is improved, but still no where compared to plastic injection kit.
From the same company, eg New G/ G System, which they r reputable n their kits r licensed, the chances of you getting a pretty bad cast kit, though lower, but still exist.because even from the same batch of production, the first one being produced n the last one, before the silicon mold cannot take it anymore, the quality can be very different.
The best, for resin, have a look at the actual product before u buy. not sample, but actual product. try buying from seller u can see the actual product. In KL mebbe u can go tkting's place, or AF Hobby.
As for Penang, i m not sure Modelland carries any.
As for online purchase, which i do too, be prepare to get the worst kinda cast. If it turns out not too bad or even good, then its a bonus. Else, treat it as part of resin kit adventure. I recommend builders with certain building (Not snap fitting) experience to try on resin.