I have tried it but I didn't invest a lot into the ones I tried so they were crummy quality and ruined the picture quality and added a horrible tint. I've been thinking about investing in some good ones lately though as I really love long shutter speeds with water photos.
I just recently did the same thing! I took the glass out of an old cheap UV filter and superglued the welding glass to the filter. Definitely beats rubber bands This works for me because I only plan to use it on my wide angle lens. If you have different lens sizes though, it may be a problem. I haven't had a good day to take it out and try it out yet. I just glued the glass to the filter last night. The last time I took it out I had rubber bands and I had forgotten my wireless remote at the house so I couldn't do any exposures longer than 30sec. However, hopefully today I'll get a chance to go try it out since I have everything all together I'm very cheap as far as filters go myself. I just can't bring myself to spend $100+ on a piece of glass. I'd much rather put that money towards a lens I've bought some crummy filters though because of it and truthfully if I added up the cost of all of my cheap attempts, it would probably be about the cost of a decent filter. However, I've had a good time being cheap! It's more tricky and calls for better editing but I don't mind; makes me learn new techniques
I think I glue-gunned mine. But it was such a faff with the focus - the weight of the bloody thing... I'm going to treat myself and order a £30 one I've seen... somewhere online... I know I saved it as a favourite somewhere... Glad to see there are other nerds out there too. You should try IR film one day, if you get the chance. I think I still have a tin of 35mm in the loft somewhere... it must be nearly 30 years old tho... wonder if it's still stable
this shot is sorta edited. I actually took three images and put them into a program that merged them to make an HDR. Other than that though, I don't think there was much editing done to this one. My other waterfall shot "Heaven's Waterfall" has absolutely no editing and it's not an HDR just a gorgeous shot!