Fred! Excellent thought. I will have to ask that question. I suppose that Correx, being a ‘honeycomb’ construction won’t expand as much. Do you think the original wood shelf expanded and pulled the lower rim of the windscreen seal away when it contracted. The mastic under the seal had deteriorated. I can’t understand why these screens fail.
Barry! The wooden shelf was held in place by screws at the back and under the seal at the front with copious amounts of a rubber mastic and round the rim and across the middle ABS supports. The screws would not have added much strength to the overall construction. The mastic did not set completely hard so when the shelf was removed it came away with difficulty but looked like a rubber gasket. Initially when I started I thought it was a manufactured seal/gasket. The mastic was absorbed slightly by the ply and it adhered to the ABS but pulled away with effort leaving a clean surface. I want to use something similar so I have bought lots of the stuff Pam and Bill used and will play with that before applying.
Thank you both for your contributions.
Tom