I joined today two dutch pilots who are flying with the Mooney of Limburgse Vleugels in Zwartberg (Genk) for an afternoon IFR flight to Oostende. This time I am sitting in the backseat as I am not current on the Mooney. The weather to take off in Genk is ok (VMC) but Oostende is still IMC. Landing in Oostende went well. When returning to Genk Zwartberg, we could’t descent from flight level 60 directly to Genk (clouds) and had to make a controlled descent in Liège. Once below the clouds, we headed VFR to Genk where we landed some minutes after sunset. Great experience.