Sonus SXF 1 and Sonus SFX 2

How well do these products work? Is there a need for the SFX 1 usually?

Sonus was once one of the more popular brands used, and while it has fallen out of favor slightly, it has still has a loyal following and for good reason -the products still produce the same tremendous results!

SFX1 is a fairly aggressive polish that is targeted at restoring heavy defects and oxidation from weathered paints or deeper marks from hard paints. Whether you need to use it or not will depend on the condition of the paint and hits hardness. It is good to have a more aggressive "cutting" polish like SFX1 around in case you need it.
 
How can I test if I need to use sonus 1 on a vehicle. Is there a way to tell how hard or poor of condition the paint is in?
 
Yes, just check it in direct sunlight. That's how you tell what you will need if you don't already have the products.

If you do have the products already, the golden rule is doing a test spot :)
 
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