peugeot 206 HDI - Leak - gwdihw

Hi , I'd really appreciate any advice or anyone elses experience on this. I 've been having to top up my coolant level every few days so I assume I have a leak somewhere. In the past on older cars I have used Radweld as a temporary measure. I was just wondering if anyone else has used this product on a 206 HDI and was it ok? Unfortunately i can't afford to get it checked out til the end of the month til I get paid.