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Bleeding
Cissing, Craters, Fish Eyes, Saucering
DESCRIPTION
Discolouration of the topcoat, either in the form of a halo, or, in severe cases, a complete colour change. This defect usually only occurs when spraying over red or maroon paint.
CAUSE
Absorption of pigment from the underlying paint, dissolved by the solvents of the new coat.
PREVENTION
a) Test the original finish by spraying a small, flatted area.
b) Use an approved bleeding inhibitor sealant.
c) Remove any overspray from the surface before painting.
RECTIFICATION
Rub down to the original finish, seal with a recommended sealer and repaint.
After Drying
Acid Attack
Bleaching
Blistering
Blooming
Blushing
Bridging
Bronzing
Chalking
Contamination
Corrosion
Cracking
Crazing
Dull Finish
Feather Edge Cracks
File Marks
Flaking
Mapping
Panel Faults
Pinholing
Polishing Marks
Poor Colour Match
Sanding Scratches
Solvent Popping
Stone Chips
Water Spotting
Wax Incorporation
During drying/curing
Bleeding
Blowing
Cissing
Contamination
Dirt
Runs & Sags
Slow Drying
Hands on Metal
During Application
Bleeding
Cissing
Clouding
Cobwebbing
Contamination
Dirt
Dry Spray
Hands on Metal
Inadequate Colour Coverage
Lifting
Orange Peel
Overspray
Pickling
Runs & Sags
Silking
Contamination
Airborne Contamination, Cement Dust, Contamination, Fall Out, Industrial Fallout, Rust Specs, Specs, Spots
DESCRIPTION
Spots, speckles or splash-like deposits on, or discolouration and staining of, the paint surface. The surface may have greasy or tacky spots, be coated with particles, or feel gritty.
CAUSE
Foreign substances or chemicals adhering to, or becoming embedded in the paint. Common sources are:
a) Tree sap and resins, wet leaves, berries, fruit or bird droppings allowed to remain on the paint.
b) Metallic particles becoming embedded in the surface of the paint and oxidising.
c) Salt deposits resulting from the evaporation of liquids on the surface. These may also lead to blistering.
d) Cement or other chemically active dust.
PREVENTION
a) Do not allow any deposits to remain on the paint surface.
b) Ensure the paint film is fully cured.
c) Store vehicles under cover and away from possible sources of contamination. Take special care not to expose new paint finishes to environments likely to cause contamination.
d) If an oven or drying room is used ensure that the filtration system is working properly, and that no industrial fumes enter the room.
RECTIFICATION
Light staining may be removed by washing the surface with a mild detergent solution, followed by washing with a 10% Oxalic acid solution to remove ferrous compounds. Rinse, compound and polish to restore the gloss. If discolouration and staining persist, rub down the surface and repaint.
Mottle Effect – MaxMeyer
MaxMeyer article on the mottle effect, explaining the patchy defect, causes and preventions, with a good bullet point summary of do’s and don’ts. Click the picture below to read the full article.
Reference: http://www.maxmeyerplus.co.uk
Preventing Re-works – MaxMeyer
An efficient bodyshop puts quality into place to prevent re-works. Efficiency is not about cheaper products but about reducing waste, that is wasted time and materials when having to re-do the job again. Cheaper products can result in defects making the process more costly. Preventing problems and making sure the work flows without disruption or re-work is efficiency. Cutting down on costs can be counterproductive and lead to re-works or more time spent on rectification, whereas spending time and money on quality can be more profitable for your bodyshop. Read MaxMeyers tech tips on how you can prevent re-works. Click the picture below to read the full article.
Reference: http://www.maxmeyerplus.co.uk