Why silicone spray doesn't make hard or painted surfaces shine?

I made the following formulas just to try it

cyclomethicone D5 66.67%
dimethicone 350 cst 33.33%

cyclomethicone D5 98%
dimethicone 350 cst 2%

But when sprayed on hard surfaces, like furniture tops, car paint or vinyl, their shine is very short lived, and leave a white residue on vinyl or slightly cracked car paint.
Why is that? Weren't silicones supposed to give gloss?

Is a Si/w  emulsion needed for proper shine?

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