Substrate. What is it and why?
What is it? This is a thin layer of soft (often medium or high acidity) base, which works as a binder between the nail and the material with weak adhesion.
Adhesion in manicure, if simple, is the strength of the coupling of an artificial material with the surface of the nail plate.
How to work with the substrate?
When do we make a substrate? - for camouflage bases, ⁃ for solid bases, usually they are marked with the words (hard, strong, build, builder), ⁃ for gels and gels-jelly, ⁃ for acrigels, polygels, multigels, and so on. On nails with a damaged dorsal layer, for example, a torn coating or sawdust (of course, I do not recommend covering them at all, but if you still decided to take a risk, then make a high-quality substrate) ⁃ if you are afraid to affect the structure of the nail the acid base in the alignment (thick) layer.
There is a direct relationship between acidity and adhesion. In hard materials (bases, gels, paigelac) acidity, as a rule, below. So the hitch is worse. That is why they need help in the form of this binding layer of soft base.
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