PPA 571 - Over-spraying with Thermoset Powders

Plascoat PPA571 can be successfully over-sprayed with thermosets such as polyesters, epoxy polyesters and epoxies.  These materials will stick very well to PPA571 provided that the PPA571 has not been over-heated.

It is best practice to apply the thermosets when the PPA571 is at a temperature of around 120°C (250°F) to 160°C (370°F).  If the PPA571 is too cold it can be difficult to apply enough of the thermoset to form a decent film and if the PPA571 is too hot the thermoset powder 'floats' on the surface of the PPA571 and a spotty finish is often obtained.

Once the thermoset powder has been applied it should be cured using the normal curing schedule recommended by the suppliers.

 If the PPA571 is re-heated from cold then this can result in poorer adhesion between PPA571 and the thermoset overcoat.  It is best to overspray with the thermoset powder after the PPA571 has been applied and has cooled to between 120 and 160°C (250 and 370°F).

25/04/2003

-- More information on PPA 571 -- Plascoat PPA 571 Data Sheet Application and fusion of PPA 571 Application of PPA 571 over galvanised steel Oxidative stability of PPA 571 Chemical Resistance of PPA 571 PPA 571 - Fire and fume certificates PPA 571 - pre-treatment PPA 571 - processing emissions Removal of PPA 571 coatings Health and Safety Data Sheet Water and food contact approvals Recommended pre-treatment over galvanised steel Recommended quality control procedures Specification for the coating of steel cable supports PPA 571 colour range Repairing damaged coatings Comparison of PPA 571ES and Polyester How long do PPA 571 coatings last...? The coating of cast iron Gassing when coating over galvanised steel Plascoat PPA 571 - Overspraying with Thermoset Powders Plascoat PPA 571 ES processing conditions Electrical resistance of PPA 571 Flame spray repair methods Procedure for ascertaining coating weights Flame spraying of Plascoat materials Plascoat PPA 571 environmental information PPA 571 colour card Removal of graffiti from PPA 571 coatings Plascoat PPA 571ES over Oxsilan pre-treatments

-- PPA571 - case studies -- Fencing - Nottingham Tennis Centre Outdoor furniture Construction projects Stadium seating Water contact approvals Coating of ductile iron pipes Coating of cable trays Fencing in the Middle East Pipe coating in Seattle 12-year test for PPA 571 Jumeirah Beach Hotel Marine environments PPA 571 for skateboard parks Water pipes - 11 year test PPA 571 for lampposts - Gothenburg PPA 571 for lampposts - La Réunion Dubai fencing A history of corrosion prevention of PPA 571 Bondi Beach telephone boxes Bahrain Grand Prix racing circuit Brisbane Bay street furniture Building regulations - handrails Monaco pier