It should be applied only on the natural nail without touching the cuticles or the skin. Suitable for difficult nails. Air dry in 30/60 seconds.
You can use just Primer SOS or just Bond Promoter. If you prefer, you can use both products keeping in mind that Primer SOS is always used before Bond Promotor.
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First SOS 15ml Purple
SOS primer, indicated for difficult nails. Strengthens adhesion to the natural nail