Attention must be paid to the ingredient mixing operation. Let the mix settle down and the entrapped gases escape, something like weaving O.
--- On Tue, 7/12/10, Nishad AK <nishadamk@gmail.com> wrote:
From: Nishad AK <nishadamk@gmail.com>
Subject: Re: [MW:8556] Pin holes in Final coating
To: materials-welding@googlegroups.com
Date: Tuesday, 7 December, 2010, 12:36 PM
Who is the Paint Manufacturer? The Paint Supplier can give you the exact solution seeing the pinholes. Generally During the MId Coat Epoxy based paint need to be applied primarily with a mist coat(around 30 to 40 % thinner to get a DFT appox half of the required midcoat DFT) ) and later or remaining DFT with the regular coat. After the mist coat a 30 to 45 min (drying time)to be given and later the secong coat to be followed.This will help the escape of air bubbles which cause the pinholes. Poor surface preparation also can be a reason also kindly check the paint system ,mixing ratio,and the application of the paint in tha data sheet which can also help you in eliminating the defect.
On Tue, Dec 7, 2010 at 10:26 AM, mohit arora <mohit2707@gmail.com> wrote: Dear, There can be many reasons for pin holes on top coat.Might be oil entraped.Perform Water Break test before Blasting of the surface for better results.
On Tue, Dec 7, 2010 at 11:36 AM, Sundaram Sundaram <nss2410@gmail.com> wrote: Hi friends,
After the finaal coating i have found large number of
pin holes on the surface.Can anybody explain what is the reason.
with regards & thanks,
sundaram
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Regards, Mohit Arora, -- Thanks and Regards Nishad AK -- 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.
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