Saravanan,
The painting defects pinholes and fish eyes were application failure,mainly fish eyes persist wen the coating surface have dirt,oil,silicone or any incompatible coating and pinholes persist wen spray gun too close with air bubbles forced into the coat,pressure difference in spray pot with air pressure ,or moisture or trapped solvents in spray.
Insists your painting operator for an careful operation.Only remedy is sand smooth the surface and recoat.
Any related queries drop me a mail.
Thanks & Regards
kevin mathew varghese
Senior QA/QC Engineer(Mech),FCE
kmvkerala@gmail.co.in
From: Saravanan Mohan <sardev@gmail.com>
To: materials-welding@googlegroups.com
Sent: Saturday, 26 September, 2009 2:16:29 PM
Subject: [MW:3324] Painting
Dear Guys!!!!!!!
The project which I am involved following the paint systems as per client spec follows:-
Inorganic Zinc(75-100 micron) as a primer
High Build Epoxy(100-150 micron) as a Intermediate
High Solid Aliphatic Polyurethane(40-100 micron) as a finish
Total Dft between (215-350 micron)
After the complete curing of the finish coat visually I observed tiny pinholes like appearance or fish eye only inspector eye can find them.
Please give me the suggestion where the problem from? this appear in almost all the painted works which applied many different days, different paint batch followed by airlesspray method.
Yahoo! India has a new look. Take a sneak peek.
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to materials-welding@googlegroups.com
To unsubscribe from this group, send email to materials-welding-unsubscribe@googlegroups.com
For more options, visit this group's bolg at http://materials-welding.blogspot.com/
The views expressed/exchnaged in this group are members personel views and meant for educational purposes only, Users must take their own decisions w.r.t. applicable code/standard/contract documents.
-~----------~----~----~----~------~----~------~--~---
Comments