I don't have much to add to this....   just my own experience ...

I have actually stop using this product a few years ago...   I too experienced its potency diminishing...

but I think It was more from... Cross contamination!    me mixing the Blue and Red ...  by mistake... 

I have switched to Mr. Mark Setter and Mr. Mark Softer

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I haven't gone back since !  I find that stuff to be more.... gentle on Japanese decals... 

Nothing against Micro Set and Micro Sol...    

I like the Mr. Mark Setter better because it has a Dulling or Matting agent in the solution...  which helps with Silvering !  sometimes I even applied the decals on Mate paint without FUTURE underneath and it didn't Silver....!!!   quite amazing stuff....

anyway..  enough product placement     LOL !

Later guys !