First thing you need to know is converting bitcoin using paypal is violating their terms so you are not completely safe by doing this.So what you have to do is find someone you can trust who is in need of paypal money and wanted to buy bitcoin so you may never be exposed.

This forum also has currency exchange where you can convert your bitcoin with trusted person on paypal transactions (note: having positive trust is not completely trusted person).I find yahoo also doing paypal transactions often so you can find his thread on currency exchange section wh is very trusted person here.