Yesterday I took the truggy apart to fix what I believed was a loose pinion gear. I had acquired some loctite 636 for fixing just that. When I opened the gear box I found that the teeth had been stripped from the spur gear and the pinion gear was looking odd. So right now I believe that regular loctite will work fine.
I am however looking for new gears. Hopefull I can find some more durable gears.