So, in my last blog entry i detailed how i had used straight hydrogen peroxide solution to submerge an action master prowl in sunlight to reverse some pretty heavy yellowing. Whilst the results were good, they werent perfect or spectacular.
In an attempt to create a better effort for Prowls turbo cycle, which also had some very heavy yellowing, i went down the DIY retr0bright paste route. For this, you can mix up your own paste using hydrogen peroxide solution, xanthan gum, glycerol and i think its oxy laundy booster, but .... since there are products easily available where the hydrogen peroxide is arlready made into a creme, why bother with the fuss of the gum/glycerol to thicken it up when you can add some very cheap and readily available corn flour (in america - corn starch), aswell as a very small amount of oxy laundry booster to act as a further catylyst.
Be CAREFUL if you`re gonna attempt to do this yourself!
So....heres the equipment i used :
Right - since the turbo cycle obviously has 2 sides, and ... in my case both were yellowed pretty equally, i decided to test out two methods. One - i bought a energy saving U.V. black light bulb and a very cheap lamp holder from amazon. This was so i could do some de-yellowing overnight, since i cant guarantee on having sunny days in good old rainy Britain! Two - direct sunlight. In both cases, mix some of the creme peroxide with some corn flour, and a _small_ amount of oxy laundry booster. Dont go mental with the laundry booster as your paste will just totally foam! (a little foam isnt bad). Mix that up so the creme thickens up so its in a form you can apply to a bot without it running off. Cover the areas you want to work on, avoiding stickers and such. Set it in place and cover it with cling film (so the peoxide doesnt evaporate out quickly).
Heres a pic of the inside set up i used with my cheap lamp holder ! I think two lamps would be ideal as you could get the UV light to shine with better coverage of your transformer.
important safety notes : DONT get creme peroxide on your skin, hair, and definitely not anywhere near your face/eyes. that stuff burns! use gloves. and if you`re working with a UV lamp - dont look at it directly ... if you need to, wear some appropriate safety goggles or glasses.
The UV side had 6-7 hours overnight, and the other side, just plain old sunlight had about 6 hours outside in great conditions, a very sunny day - i got lucky on that one.
Anyway, here are the results of both sides. I think the sunlight side showed better results, although i think the UV lamp side would have worked equally well with a longer duration
I`m pretty happy with the results - its certainly a better result than total submerge in hydrogen peroxide and a) its a lot cheaper, b) its easier to work with and you dont lose stickers c) its easier to clean off afterwards.
If you`ve done similar work at restoring yellowed transformers, get in touch and share your results :)
I reckon i might try and get hold of a knackered jetfire from ebay and disassemble it so that the components can be treated individually. Should be a fun task :)