Also you need to look into the staying power of your sunscreen. MOst of the drugstore brands only last for 1-2 hours after application so you will ned to constantly apply it. If you have make up on this will be a hassle ^^;;

You might one to try some of the spray on ones like from bananaboat. This you can constantly keep with you and spray when you need to go out into the sun. More so if your desk is near a window.

Splurge if you can or if you are serious about sunscreen protection. Get Clinique City Block I think it's SPF40++ or higher. It's UV protective power has been said to last the whole day. There are some other brands like Neutregena but that product is not available at our pharmacies yet.

Ah yeah... i have that problem too... some of the new ones these days are greasefree tho... but those cost more. Water base is good but sometimes even then make me feel like i have a layer on my face.

sunblock, let it dry, foundation, powder... it depends on how much you put. Don't go applying it like butter on bread.