Retro bright process
This is how I remove the yellowing found on old plastics. Not my idea, just the result of many internet searches and experiments.
What you will need
- Metal foil
- Tape
- Cling film
- UV lights (USB LED strip lights are just fine)
- Bblonde 40vol, cream peroxide
- Rubber gloves
- Access to clean running water
- A big container (big enough to contain the parts layout unobstructed)
- Washing up liquid
- A small(ish) brush
Preparation
- Remove any ancillary pieces like light guides or removable pieces
- Wash plastics in warm soapy water to remove all dirt and grime. Rinse and dry thoroughly.
- Mask areas that you want to protect using masking tape
- Line your container with the foil, shiny side inward. Use tape to hold it in place if needed.
- String your lights across the top evenly, and keep each run in place using tape.
Process step 1: Apply peroxide paste
- Lay out some cling film and put your gloves on.
- Carefully paint the parts in the Bblone peroxide paste using the brush. Cover evenly and generously.
- Quickly wrap and seal each piece in the clingfilm.
Note: Preventing the paste from drying out is essential, so a good seal is needed!
- Repeat for each part.
Process step 2: Ultra violet light
- Place your parts in the foil-lined box.
- Switch on the UV light and cover the box with foil
- Monitor the parts every 12 hrs or so, and rearrange them to ensure even exposure to the UV light
- Agitate and/or reapply the peroxide paste as needed throughout the process.
Note: Preventing the paste from drying out is essential!
The process can take many days to complete. So, be patent and take the time to ensure you have achieved the required results. There is no need to remove it too early.
Ending and cleaning up
Wash the parts thoroughly in clean water. Ensure all the peroxide paste has been removed, which can burn, especially when it has dried up and concentrated a bit.
