Someone else posted this on here somewhere.. but the clear resin can be used to make the clear parts clearer.
I've used a brush to paint clear resin on clear parts, I then put them under water in a UV light, to cure the brushed on resin, it will not clear without the water. The parts come out a lot clearer, and remain so longer, however you can still see bubbles and "whitened" layers trapped inside the part.
I guess this works because it fills and smoothens all the gaps and cracks between the laser cured lines in the resin.
I've been thinking of ways to make use of this, without it going on so thick, and keeping it thin, like diluting or warming up the resin to make it thinner, maybe this would help get it inside hollow parts.
I have not had a working MIni-Z in a few years... but I use to frequent Mini-ZRacer.com... (User: Draconious)