I used these from Bunnings and used silicone to the houseHow are you attaching the chromatrim to the house?
I've had those clips attached to a couple of places on the house but screwed on as they are up quite high and not so noticeable but they have been there 4 years now in the sun and the rain and they are still good as new. However, I hadn't thought about using silicon for them further down the house as I guess they could be removed after each christmas assuming it doesn't damage the paintwork when removing. I might give your silicon idea a go and see what happens.Yeah, the 20mm electrical conduit. I haven't had any issues with it so far.