Given a top quality pop top such as a SCA roof costs about £6000 for the roof alone, I’d be very wary of anywhere that claims to be able to supply and fit a pop top for £2000 and in a day. According to Sika’s technical guidance, the sealant/adhesive system used (usually Sikaflex 252) to bond pop top frames to the van’s roof panel takes several days to fully cure and the vehicle shouldn’t be moved within 24 hours as a minimum.