When are you planning on using that shrinking wheel? I would love to see some pics as to how it works. Thanks
I've used it for about 2 hours now, and it seems to work pretty well, though on a small area that I'm working, it's hard to tell. Here are some photos of the fender AFTER using the shrinking wheel on it, and some off block hammering. Metal thickness between the old and the new sections is pretty stark on the edges, so it's creating some challenges that may result in some additional metal replacement in a couple of areas.
Early on
PRIOR TO BLASTING
AFTER BLASTING (NO ADDITIONAL WORK DONE YET)
fyi - this was blasted with crushed glass. There is NO primer on the fender.
Lots of low and high areas still. I will finish this work and hopefully take my lessons onto the larger sections of replacements I need to do. X your fingers!
Word to the wise - cut out larger areas if you think the metal is thin anywhere near the rust. It sucks going back and cutting and patching larger and larger areas. That just creates something that looks like your grandma's quilt, not a panel on a vehicle.
Using the disk is easy, but a little strange at first. You basically run it on an angle grinder and use it to heat up the high areas on the metal. Once you heat it, you use a spray bottle or wet rag to cool it down quickly and shrink the metal. Rinse and repeat until the high spot comes down. There is a really good youtube vid showing a guy working on a crappy looking area on a classic rebuild and it comes out looking pretty good after what was probably 1.5 hours in real time. Heat, cool, heat, cool, hammer, sand, heat, cool, hammer, sand, etc. (
Here is the video. Note: it is a video by one of the sellers of a shrinking disc. It is who I purchased from.)
I used the small disc at first, but then switched to the larger one, which worked much better. My issue is that I have a 6" Metabo grinder but it spins too fast for the rating, which is causing it to potentially heat too quickly and making the disc get rough (snagging on the metal), which is making take off a little bit of metal if I don't smooth it back down every 5-10 minutes. Doesn't take long (I use a 2" grinding disc and spin both at the same time to sand it down).