Cheers for the comments guys, think I'd better get this finished up now.
Unfortunately I had a few hiccups over the weekend
After 'finishing' the first caliper and leaving it for a while, I decided the paint was still too soft to start putting in the pistons so I put it in the over for a while to help the curing process. Last time I painted my calipers I did this and it totally ruined the job as I thoik I put it too high too soon and it melted the lacqeur. This time I had it on 50 degrees for about an hour and a bit then went up to 100 degrees for about another hour. Again it didn't work
As you can see from the pic, the paint ran on to the decals. What you can't see is that the edges of the decals turned up slightly too.
As the pistons still weren't in at this point I decided to fit them before try to fix the paint. Unfortunately I was eager to get finished so didn't get many pics.
On each side of the caliper there are obviously 2 pistons but they are slightly different sizes so I set the new seal kit out in the order it goes in.
I put the inner o-rings in first using a bit of brake fluid as lubricant. If I got any brake fluid on the paint I soaked it up with a bit of kitchen roll / loo roll and cleaned the spot with panel wipe (the same stuff in halfords paint preparation wipes)
Before refitting the pistons I gave all the sealing faces a light sanding with wetted 1200 grade wet and dry, as I mentioned before the pistons felt quite rough and this could have been a possible cause for the brakes not being great (I hope!)
I fitted the outer (weather) seal before fitting the pistons as I thought it would have been a nightmare once they were pushed in.
With the caliper lying on its side I smeared a good bit of brake fluid around the inside of the caliper and a light smear around the piston itself. I then offered the piston into the hole (remember there are different sizes) and rolled it between my fingers as it slid down and caught on the inner seal. I then got my large screwdriver, placd it across the face of the piston and pushed my weight down on top of it. If it doesnt go in straight away roll the screwdriver back and forward a little bit and it should drop down. Then all that was needed was to push the outer seal into place. I just used the handle of a fork to do this. Be careful what you use here this would not be a good point to split the seal!!
Last but not least refit the pad guides. I bought some new stainless M6 screws just to tidy everything up. I am also tempted to fit new bleed nipples but the shop is miles away so might just fit the old ones.
In the end I sandedd back the decals, resprayed, fitted new ones and lacqeur. Both calipers were finished this morning and I intend leaving them for at least 24 hours before fitting them to the car.
When fitting to car
- High temp paint takes a long time to fully harden and is supposed to be cured. After my preivious problems with the oven I have decided not to cure them again but to bed in my new pads they will get a lot of heat round them anyway so I'll jut have to see how it goes??
- I think the only thing I might have done differently would be to fit the pistons before putting the calipers back together. It is very easy to damage the paint while you are fitting the pistons as it is so soft. My original thinking was if I painted it first I wouldn't get any overspray on to the outer weather seal but if you pushed the pistons in while the caliper was still split you could take your time and mask round it