Help. Painting Question

[pkitchen]

I have been repainting my porch as it was varnished and I am changing it to white with a blue door. The porch is no problem, but I am having problems with painting the door. I am using Dulux Weathershield top coat with their recommended grey undercoat. I used International primer to paint the stripped door. The first coat of undercoat went on fine and I sanded it down in prep for the second coat as instructed. I finished painting the second coat on Sat at 12.30 pm and left it to dry outside lying flat on a couple of sawhorses. By 8.30pm it had started to rain which wasn't too bothered about as the drying time is 4 hours. The following day I repositioned the door to make sure it fitted ok as I needed to plane a few bits off. However I discovered that the paint was still soft and in fact hadn't dried completely a day later. I checked it this morning and it is finally getting hard Question is: would the rain have caused the problem, and how do I recover the situation. Can I just sand it down once its dry or do you think the paint might be damaged.
Sorry for the ramble.

[robinhood21]

If the rain hasn't pitted the undercoat, then it should be OK. Even when pitted, it's usually just a matter of sanding and applying the next/finish coat. Paint never really hardens, but stays pliable. When it does harden 'tis time for repainting.

[pkitchen]

Cool thanks will give it a go on Friday.

[robinhood21]

Only thing to add: Next time, use the Weathershield primer if you are using their U/C and gloss. It really is good stuff.