I urge everyone to bookmark that blog; it is always a fascinating tour of the weirder and wonderfuller places on our planet. And let me leave you with this simply jaw-dropping video of undulatus asperatus in action.
(A sunscreen with a physical block like titanium dioxide or zinc oxide can be applied last, after a serum or moisturizer.) Apply a serum next and, finally, moisturizer if you need it. Polis also recommends serums or sunscreens with moisturizers built in because they save time.
Use acids without alcohol and menthol, avoid Active serum, Pro-Heal serum and Hydra-Cool serum by Is Clinical. They have 3 good product in their range - Cleanser, Super Advanced serum with vitamin C and Youth eye cream. The rest of their line is a harmful expensive disaster.