[pipfit]

Just erected a Halls greenhouse having terrible problems fitting the glazing gasket any help greatly appreciated Thanks
Pipfit

[Gwiz]

washing up liquid often helps as a lubricant to get them seated correctly into the groove.....

[Oakfield]

The rubber on these greenhouses varies so much between each one - Sometimes, you can just slide it in effortlessly from one end, but sometimes you have to work an inch at a time, getting one side in and then push the other side in with a flat screwdriver or scraper.

Most of the time you can slide it in from the end (before erecting the greenhouse), sometimes with the help of some soapy water, but make sure that you push as well as pull, or the rubber will shrink back after you cut it.