Quickly absorbed oil free 15% aha gel for rough dry thickened skins treatment. fluidbase 15% aha gel eliminates the accumulated dead cells and leaves a healthier looking skin with smoother texture and suppleness. fluidbase 15% aha gel is also highly recommended for acne and oily prone skin.use: apply massaging gently once a day, preferably at night during the first week of treatment on affected areas. the gel can be applied twice daily from the second week on.