Hi guys, long time reader on this great forum, ended up signing up a while ago to ask a question but lost interest in the project (haha).
I've since purchased some clear PETG after doing countless hours of research as I read that it has the best clarity out of all the plastics (this could possibly be wrong though!).
Anyway, I'm attempting to make clear headlight covers for my car and have been having the same problem which is pretty much a loss of clarity after forming over the mould.
The mould is made from plaster of paris which has been dried for a few months and sanded back with 600G sandpaper.
After reading this thread:
http://www.therpf.com/f9/vacuum-forming-clear-petg-problems-205666/?highlight=PETG
I formed a 1mm styrene sheet over the mould and then formed the 2mm Clear PETG over that after someone said that forming a 'skin' over the buck would get better results with the clear PETG, but the same problem is still occurring unfortunately.
Excuse the crappy phone photo's, I couldn't get the loss of clarity in the camera but I did turn the phones flash on which makes the small 'spots' and 'dots' cause a shadow over my palm:
As you can see on the left side of the pictures, the waviness/blotchyness is much more apparent.
Any idea what I'm doing wrong ?
Cheers
I've since purchased some clear PETG after doing countless hours of research as I read that it has the best clarity out of all the plastics (this could possibly be wrong though!).
Anyway, I'm attempting to make clear headlight covers for my car and have been having the same problem which is pretty much a loss of clarity after forming over the mould.
The mould is made from plaster of paris which has been dried for a few months and sanded back with 600G sandpaper.
After reading this thread:
http://www.therpf.com/f9/vacuum-forming-clear-petg-problems-205666/?highlight=PETG
I formed a 1mm styrene sheet over the mould and then formed the 2mm Clear PETG over that after someone said that forming a 'skin' over the buck would get better results with the clear PETG, but the same problem is still occurring unfortunately.
Excuse the crappy phone photo's, I couldn't get the loss of clarity in the camera but I did turn the phones flash on which makes the small 'spots' and 'dots' cause a shadow over my palm:


As you can see on the left side of the pictures, the waviness/blotchyness is much more apparent.
Any idea what I'm doing wrong ?
Cheers