Is this balm suitable for use under lipstick, or will it make color application patchy?

This balm can be used under lipstick, but its suitability depends on your technique and the lipstick formula. As a protective, emollient balm designed to reduce moisture loss and soften lips, it creates a hydrated base. However, if applied immediately before a matte or long-wear lipstick, the residual slickness can cause the color to slide, bleed, or apply unevenly. For best results, apply the balm generously as part of your morning routine or at least 10-15 minutes before applying lipstick. Gently blot any excess that hasn't absorbed with a tissue, leaving your lips feeling conditioned but not greasy. This provides a smoother canvas. It works well under creamy, satin, or sheer lipsticks that benefit from a hydrated base. It is not a dedicated gripping 'primer' for extreme longevity. For a midday touch-up over lipstick, apply very sparingly to only the driest areas to avoid dissolving the color. Ultimately, it's a care product first; its compatibility with makeup is a secondary, practical consideration.