車模起疹子的原因主要還是因為車模生產商偷工減料，在合金裡加入了雜質。

我那些早年的UT/Maisto從來都沒起疹子的現象也就不言而喻了。

另外可以嘗試用打磨膏適度地緩和起疹的現象，如果不是太嚴重，其實還是有得救的。

1. It is caused by impurities contained in the zinc.

2. It can be described as an irreversible chemical reaction triggered by the presence of such impurities changing the molecular structure of the alloy, and which inevitably leads to permanent damage.

3. In diecast models, this is known to appear as paint chipping, cracks or change of the shape of the objects.

4. It occurs randomly, as it depends on the level of impurities contained in each single model. This is obviously unknown and can’t be determined. Thus, while in the worst case scenario most of a production run might be contaminated, it might also happen that a single model out of an entire run might be unexpectedly affected.

5. It is also influenced by heat and light, and exposure to higher temperature and direct sunlight might enhance it. It should be clear however that storing models in a refrigerator in the dark will not avoid its occurrence. If the model was made with tainted metal, sooner or later the defect will surface and it may take several years to develop.

Most diecast models were due to the use at some time of poor quality zinc for manufacturing. Whether this was accidental or due to negligence is neither known, nor is of any importance at this time. The problem is and remains on the table, either if people complain about bad luck or moral integrity or, on the other side, bury their heads in the sand like ostriches.

I think that the only useful option now is to make collectors aware of those models known to be affected, as there is no cure for this disease.