Heavy organic coatings including underseal, filler, mastic sealants, anti-vibration materials and adhesives are broken down using SPL’s advanced dehydration process.
Stage 2. Organic Material Removal
The remaining organic compounds such as paint, grease, oil and carbon are now removed in an alkaline hydrocarbon solution for prior to a water rinse.
Stage 3. Rust Removal
Corrosion is now removed via immersion in a dilute solution of inhibited hydrochloric acid. Inhibitors prevent the acid from attacking ‘good metal’, only breaking down the corrosion. Tilting the shell backand- forth within the solution improves penetration and helps displace air locks. SPL is happy to advise the best ways to attack inaccessible areas on even rare or unusual cars.
Stage 4. Passivation Rinse
An advanced agitated alkaline neutralisation and passivation immersion process follows. To ensure maximum penetration, a neutralising preservative is applied by hand, into the seams and recesses leaving the shell bright and stable. SPL recommends the shell be weld repaired at this stage, before a repeat of stages 3 and 4 prior to electrophoretic coating.
The Cleaning and Protection Processes
Stage 1. Pre-treatment
A thorough eight step process covering cleaning, conditioning and phosphating. The cleaning process utilises varying strength alkaline silicate solutions at 50ºC to remove oil and grease followed by water rinses. Following a conditioner rinse, the shell is immersed in a bath of zinc, manganese and nickel (tri-cation) phosphate solution. Water rinses remove the excess phosphate solution and finally the shell is rinsed with demineralised water.
Stage 2. Electrophoretic Deposition
Next, the shell is fully immersed in a 33ºC, 55,000 litre PPG paint t a n k . Experience ensures a highly uniform paint film of between 22?m and 28 ?m with excellent bond strength is achieved as an electrical current of around 400 volts and 600 amps is passed through the shell. An Ultra Filtrate molecular resin solution rinse is then applied prior to curing.
Stage 3. Rust Removal
The shell passes through a high temperature oven at 180ºC for 45 minutes. This will cross-link the polymer resin allowing the coating to become smooth and continuous. Crucially, the controlled heat drives out residual moisture from within the seams and box sections.