If you're worried about sealing it, then get some of the draught excluder type sticky backed foam, we used in on our 2nd hand greenhouse (that had also been mastiked previously), and gives a firm footing for the glass as well as some cushioning, plus makes the w clips have to work a bit harder, so much more secure!
We got ours off ebay, 5 rolls for about £12 if I remember, and used most of it on a 10' by 8'
Hope this is of help! |