Sill cover removal. Long post alert
It's worth taking the time to read through it as there are some 'gotchas' you need to be aware of to ensure the covers go back on to a factory standard. I messed it up the first time. Easily done
Removing the sill covers is fairly easy, just need to take your time. The sill covers are very tough, so don't worry about snapping them. What you need to be careful of is not damaging the good paint with a blade when cutting through the double sided tape.
I started at the front because the rust had destroyed the paint, therefore that end of the cover pulled away from the car very easily. Whilst prizing the sill cover away from the car with a plastic wedge, I sliced through the tape with a scalpel, and worked my way along to the back of the car 3-4cm at a time.
At the back you may find there is a massive blob of urethane glue (you can see it on the 4th pic down, first post) bonding the cover to the car. This was a right pain in the arse to break free. I used assorted plastic trim removal tools to peck away at it until it finally broke free. Be very careful with this bit as you can leave a permanent indent in the sill cover if you gorilla it. I believe you can get urethane glue removing chemicals but it may damage the paint. Not sure. That was by far the most tedious, difficult bit of the whole removal process.
Once all the tape and glue is broken free, lift the sill up and off the car. You will be left with a long plastic guide strip and 9 self tapping screws, and a big load of double sided tape to remove from the car...and sill covers. Simply slide the plastic guide to the right and it will pop off the screws.
Remove the screws with a 5.5mm socket. These may be rusted. A few of them broke off on mine trying to undo them. New screws are available from the dealer and I would replace them all personally.
Once the cover is off, you're now faced with the hideous task of removing the tape leftovers and glue residue from the car. For this you will need a Toffee wheel. Pop it in your drill and run it at a slow speed. It will grab hard, so hold onto the drill tightly. You may find your drill overheats and shuts off doing this (4 meters of sh1t per side to remove!) so give it a rest every few minutes. If you over speed the toffee wheel, it WILL take your paint off, so be very careful.....but it's 1000x faster than using Goo Gone or similar oil based glue remover. Don't use cellulose thinners as it WILL wreck the good paint.
I recommend using the toffee wheel on the sill covers first to get a feel for it as they are a lot tougher than the paintwork on the car.
After removing all the tape from the car and sill covers, treat the rust and repaint the affected areas accordingly.
For repairing rusted areas under the factory seam sealer, and also to replicate the dimpled finish on the sills, I used U-Pol Grey Stripe.
For paint, VW do rattle can kits, or I found Halfords paint was a good match, and a lot cheaper. I used U-Pol Clear One laquer as it's way better than the factory stuff. Red cars in particular will benefit from that as it's UV resistant.
When it comes to refitting the sills, honestly, I highly recommend doing a 'dry run' without the tape first to get a feel for how they line up on the bodywork. First you need to refit the plastic guide strip (VW used this to make sure the cover sits dead parallel on the car) onto the 9 screws mentioned previously. The sill cover then clips into said guide strip and it's important you slot it in fully along the whole length or it will never line up properly.
Start at the back (important!) as the body to cover profile is very exact. Offer the sill up, and when you're happy with the alignment, pull on the tape's backing strip and work your away along towards the front, pushing the sill onto the car firmly as you pull on the backing. If you want to reapply a blob of urethan glue, go ahead. I did. I figure VW put it there for a reason so I did the same. The glue is also a good 'get out of jail' card to stick the cover down afterwards if there are gaps.
Don't use cheap generic double sided tape either. The stuff you need is 1mm thick 3M automotive tape (linked below) and it will stick down perfectly.
Hope that helps. You'll see what needs doing once it's all off the car
Useful links:
3M automotive tape -
https://www.amazon.co.uk/gp/product/B01DVWCXWG/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1Toffee Wheel -
https://www.amazon.co.uk/gp/product/B00ATPOH3C/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1Plastic razor blades -
https://www.amazon.co.uk/gp/product/B07CZC21YF/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1Goo Gone -
https://www.amazon.co.uk/gp/product/B00006IBNJ/ref=ppx_yo_dt_b_asin_title_o05_s01?ie=UTF8&psc=1Urethane glue -
https://www.amazon.co.uk/gp/product/B002SQY852/ref=ppx_yo_dt_b_asin_title_o03_s00?ie=UTF8&psc=1Seam Sealer -
https://www.halfords.com/motoring/paints-and-body-repair/fillers-and-preparation/u-pol-grey-stripe-1l-154195.htmlClear coat -
https://www.halfords.com/motoring/paints-and-body-repair/scratch-repair-and-paint-restorers/upol-clear-1-aerosol-387662.html