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Originally Posted by DavidB Hi Scott,
They are both fine polishes, with Sonus Paintwork Cleanser (SPC) being the finest. Sonus SFX-3 does not have chemical cleaners, whereas SPC does. The chemical cleaners in SPC will remove light oxidation and the grime that gets deep into the pores of your paint that clay cannot reach. For hand application, SPC is a better final polish than SFX-3.
Of the two, I like SPC the best because it is easier to apply and the final finish is squeaky clean.
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David, I was under the impression that SFX 3 is a finer polish than SPC from both my experience with the product and this chart
Polish Chart.

I've used SPC first then followed up with SFX 3.