Before commencing any refinish work, we recommend that you perform a solvent resistance test on your vias to identify any layers that may be solvent sensitive.
Solvent sensitive layers may be:
Thermoplastic Acrylic (TPA) Paint
Nitrocellulose varnish
Non-curing synthetic resin coating
Solvent Sensitive OEM Paints
Test Methods
After sanding, dip a cloth in Glasurit 352-50 or -91 Reducer and rub over the sanded holes. If one or more layers of paint swell, dissolve or become tacky, they are sensitive to solvents.
tips and tricks
When repairing such layers of paint, please note the following:
The sanding process should be finer than normal with more coverage
Do not use any polyester padding on feather edges, while
Use filler/surfacer and topcoat only in thin, lightweight paints and allow good flash off time between coats
Do not use wet on wet primer or system
Dry carefully with an infrared heater (do not dry on TPA substrates)
Use only suitable finishing processes
Where sensitive coatings are found and form high films, strip them back to bare metal
Paint system layers that have proven to be extremely solvent sensitive need to be removed prior to any repair work
