Bodge it Quickly

Plastering the hallway wall has been made doubly difficult by buying poorly stored Thistle plaster from B&Q. It went solid in 5 minutes. I returned what I hadn't used and swapped it for some later dated stuff - that went solid in 15 minutes. I returned that and got a refund. I have half a hallway wall that has been plastered in sections of 5 minutes and 15 minutes. It looks a bit crap but has cost me nothing up to now.
I see I have an echo of last year's blip.