Thanks everyone. Now to get down to work!

I've been using to Tamiya gray putty (I think it's the same chemical composition as white) for many years on my boats. I have not had any problems. This putty seems to adhere to just about everything, especially when my fingers.

The only thing I don't like about the Tamiya putty is that his it has a high shrinkage factor. So, when applying you need to use multiple layers with the final layer being a slight convex shape so it can be sanded down flush.

Lew

It can be ok on boats but still needs a coat of paint on it. I’ve used the putty you patch walls with. It’s the one that is pink and drys tan. It sands well but I coat with paint or even CA glue. It’s not waterproof but decent coating it can last. There is always the Bondo filler that is in a squeeze tube too.

A good day
I always use 2 component epoxy
But a friend of mine is using the sprayable filler from MOTIP
Which you can buy in car shops
Regards
Herman lifeboat lover

yes, and no!