Old greenhouse in need of replacement glass or other suitable medium

If you want to get technical about things Pete..then go ahead! :D ..... And don't foget to add that, low modulus must be used on aluminium to avoid corrosion,which will result in a 'white wash' stain on the glazing panels.. :D :D
I can see I am dealing with a pro here

 

No, not trying to be flash. :D
I used silicone on some polycarbonate some years back and used the usual (aquired from work) High modulus acetic cure stuff, which didn't stick too well to the polycarbonate and was not a great sucsess, so thought it was worth a mension.

 

Ah now I know what "low modulus" means - I've often wondered.
Interesting what you say about the use on aluminium Pal. For years there has been on on-going debate among radio amateurs about using the niffy acetic type of silicon to seal joints in aluminium tubing in antenna systems and joint boxes. The conventional wisdom is that one shouldn't use it as it leads to corrosion, but I (and lots of others) have been using it for years with no signs of corrosion. In fact I've peeled off 5 year old silicone to reveal bright metal at a joint while next to the joint the unprotected alloy has shown signs of weathering.

I suppose though that any slight leaching close to a glass or synthetic panel would be much more visible. I actually used low-modulus stuff to try to cure a leak in the GH a few weeks ago. Wasted my sealant and time though as five minutes after I'd finished the heavens opened and washed most of it away

Edit-

Just spotted you last post Pete. I used high modulus stuff on the poly carb sides of my new propagator. It didn't stick well there either.

 

I don't think using the low modulus on ali greenhouses matters really, I just have to be careful at work when working on Oak frames.(Pete will know this )which react to
high mod',and Leaded light windows too.Both stain and look a mess.Just to add to the confusion I now prefer to use a polysulphide rubber mastc as much as I can....beauty of it is ,that it's paintable and much stronger.

 

I used polysulphide on my PVC windows, I like it. As you say paintable.
Pongs a bit though. :D

Dave the high modulus seems good on fish tanks etc. anything glass or vitreous ceramics but not on plastics.

 

Interesting stuff guys. All useful grist to the DIY mill.