Thanks Barry & Tom.
I covered suspect area with tape yesterday ( difficult at front area because of skylight frame) – we have had several good storms here today and so far it seems ok.
Thats good news as I can wait out the weather.
My old type skylight seems ok so apart from potential damage to the fragile inner frame trim ( which I hope to beef up and spray), I hope the only outlay will be sealant and sealant remover.