[MW:8584] Re: Pin holes in Final coating

mostly bacause of the paint mixing,check the paint mixing,

haseeb

On Dec 7, 2:30 pm, Shashank Vagal <nach_...@yahoo.com> wrote:
> 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 <nishad...@gmail.com> wrote:
>
> From: Nishad AK <nishad...@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 <mohit2...@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 <nss2...@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,
>
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> Thanks and Regards
>
> Nishad AK
>
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