Sermaloy J Diffusion Coating hair crack repair

[demionkrishan]

Hi! All, rarely I used to get hairline crack on fillet area due to high thickness. thickness requirement is 35-80 microns, sometimes when 
the operator added one extra pass to match the coating thickness, this used to be happened. As I aware this process is very complicate. 
My question here is
Is this crack can be repair before sending it to diffusion Heat treatment or after drying / curing in the Oven? 
After Heat treatment, if the thickness is less, is it possible to recoat??

Regards,
DK