Hi New here, and I have a burning question. (Well hopefully nothing will get burned). Am already a keen restorer of vintage handcrank sewing machines. Which means I have some Maas Cream to hand. Today I had my first, modest foray into older pens as a Parker Slimfold I'd ordered on eBay at the weekend has turned up. It looks pretty sound but I want to take it apart and clean it. Have found out how to do that with a simple pen like the Slimfold and feel confident enough to try as it wasn't an expensive pen. Now I keep reading about Simichrome but I already have both Peek and Maas Cream to hand. Sewing machine restorers seem to favour Maas for machine brightwork and I have had great results with it. Before I waste money.... anyone tell me if I could use Maas for the plastic barrel of a fountain pen? I have a 'sacrificial' old pen I could try it on first but was curious to know what you folk here think? Luckily, I also have a collection of Anglo Saxon and onwards metal artefacts that we seal with Renaissance Wax so I do have that to hand...