Exterior paint on plaster board OK?

[tea lady]

I have lined my studio/shed with plaster board and was going to just paint all the interior with the exterior paint I have. Is that OK over new plaster board, or does it need to be undercoated? The exterior paint reckons it is primer and undercoat in one. Is that just on wood?

[echnidna]

that'll be ok on plasterboard except some of the exterior finishes might take a week or so to lose their slight tackiness

[tea lady]

Why? Its only Sola guard acrilic paint or something. Is it meant for wood and works differently on plaster board?

[Bleedin Thumb]

The only difference I can discern between ex and interior is their ability to last in weather..probably a bit more zinc in the former.

I would have thought that if an exterior paint stayed tacky for a week you would have trouble if it rained. Maybe you had a bad batch of paint once Bob.

[echnidna]

Solargaurd dries quick but retains a very slight tack for about a week.

I'd use it

[Ashore]

solarguard will be fine and needs no sealer or undercoat the only drawback is its expensive so there's proberly cheaper options

[tea lady]

Well, I've already got the paint for the outside bits, so I just thought I'd use what I've got. It was a miss tint special, so pretty cheap. (Like $8 for 4 liters.)