Once you want to use sunscreen and mosquito repellent, you must use the sunscreen first. CDC suggests using sunscreen first and not using combined sunscreen and mosquito repellent.
Are insect repellent and sunscreen ?
It is not good practice to use the insect repellent and sunscreen togather. All the screen repellent are not designed using the mild ingredients. But if you want to use the insect repellent and sunscreen togather, You must use the sunscreen first, then you should use the mosqutio repellent.
Some factors you have to know before using sunscreen and insect repellent
The common ingrediens of the sunscress is oxybenzone. If you use DEET mixed mosqutioe repellent togather, there may have possibilities of absobin DEET as oxybenzone absobing DEET. Because of this expert suggest not to use the DEET mixed ingredients with sunscreen.