Okay, so I tried using the old Silly-Putty and Exacto method (with a brand new blade) and the cutting process is still too random and free-hand for my tastes. I ended up scrapping about 5 bucks worth of canopy 'cause I wasn’t satisfied with the results. Either I:
A - cut in the frame itself, or;
B - I leave an un-sandable little ridge were I didn’t take enough of the backing off. I then try to shave off said ridge with the exacto and… well… see problem “A.”
Does anone else know of a more precise method? Can I use a grinding wheel in a Dremel maybe? I figured I ask before experimenting on the only greenhouse I have left. Any help is greatly appreciated.
I usually apply masking tape over what I don’t want to cut into, then do a rough trim with the Dremel whell, followed by a precise shave with a scalpel or Xacto. Works pretty well.
Try this: tape off the canopy, trim to the closest possible tolerances, then support the canopy with your finger and carefully sand off any offending excess plastic with your sanding sticks. By applying judicious pressure with your supporting finger, you can get things pretty close. Finish the sanding with the same process you’d use to buff out any other clear part, and I think you’ll be happy with the results.
For vacform canopies I use the following methode.
I mark the edge with a permanent marker, so it’s clearly visible wich put needs to be cut of. I then cut with a very small scissor. Final trimming is done by sanding.