I will go into the details of assembling/erecting my new greenhouse later, but wanted to get this out ASAP:
I read where it was advisable to use silicone caulk as an additional adhesive/sealant to better secure the clear plastic window/panels to the framework of the greenhouse. This is indeed advisable.
HOWEVER: Make sure you check the expiration date of the silicone caulk. I learned this the hard way. I just bought this caulk off the shelf at the local hardware store on Saturday (4/5/09), took it home and used it the same day. Now, 2 days later it still is not curing and is just as free flowing as when first applied. Now, I have done alot of caulking over the years, including using 100% silicone caulk, and never had a problem like this. Subsequently, I googled it and found other people had this problem and it was because it was beyond the expiration date. To further research this, I went to the GE mfgrs website, and sure enough, if it has expired IT WILL NEVER CURE!!! It remains like a gooey lubricant. I checked the tubes I bought and they had an 10/08 expiration date.
The only recourse is that you get a refund for the product. Unfortunately, that doesn’t nearly begin to compensate for the major effort it will/would take to remove the silicone that you have already applied. You have to totally remove all the expired silicone, using isopropyl alcohol as necessary. In my case I am not going to bother with it, and will just leave it. I had applied 4 tubes of this stuff in 3/16″ wide channels. Can you imagine trying to remove some 300 lineal feet of this? Plus I would have to remove all the panels and risk damaging them in the process. Plus not only would I have to remove the silicone from the channels, I would also have to remove it from the panels. This stuff is so gooey/sticky, that the task would be virtually impossible.
SO: If you are going to use 100% Silicone Caulk…be sure to check the expiration date…and buy it as far from the expiration date as possible!
Also, I had bought the GE Silicone II Caulk. A number of the reviews mentioned that DAP brand is a much better product.
I love my new greenhouse, but I still am very upset over this silicone caulk issue.
FURTHER LESSON LEARNED: Always check expiration dates. Never assume the store is rotating stock or pulling expired stuff off the shelves!