What characteristic of light cured gel products helps protect them during storage?

Opaque packaging is essential for light cured gel products because these materials are sensitive to light, which can cause them to harden or lose their effectiveness if exposed to certain wavelengths, particularly UV light. By using opaque packaging, manufacturers ensure that the gel remains stable and usable for a longer period during storage, protecting its integrity until it is needed for application. This protective feature minimizes the risk of premature curing or degradation that can occur when products are exposed to light before their intended use.

Other characteristics like small size or quick application do not provide the same level of protection against light exposure, and while squeeze bottles may be convenient for dispensing, they typically do not offer the necessary barrier to light that opaque packaging does.