(question answered) Cheers Ape and Al

[northwind]

What's the absolute shortest time you can leave a cellulose undercoat under mild heat before you can sand it? Project Pathetically Overdue, Utterly Frustrating B*£tard Paintjob has struck again... ;)

[Stig]

If you put thin layers on, quite quickly. couple of hours. If it is coated on thick, 24 hours.