Guidance needed on exterior painting

MarcusMaximus

Our house needs re-painting on the outside which means the window and door frames etc., i.e. just the woodwork. I’ll be keeping it white as it is. The painter who did it 5 years ago actually used an internal paint on it and a lot of that has started to crack, though most of it is still intact. I’m not looking to do a perfect job and would intend to paint over the existing surface - it’s mainly to protect the wood from the elements, as along as it looks ok.

So I have a few questions: Would it be ok to sand down and then prime the cracked areas but leave the good areas alone apart from light sanding for key, and then paint over the lot? Would that require one or two coats? Is it ok to paint over the existing interior paint with an exterior one, or is there likely to be a reaction? I’m not sure exactly what paint he used but I’m pretty sure it was a matt or satin type. Any other tips welcome thanks.

Rows Grower

Use the primer (2 coats) on the good areas as well.

MarcusMaximus

Thanks very much for that. So 2 coats of primer everywhere and then 2 coats of exterior paint? I presume the primer will adhere to the old interior paint that is on it at the moment, once it's sanded/keyed?