Black Jack Roof Coating not sticking to Polyester Powder Coated Metal Sheets

rvp

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Quicky lads,

I have some Polyester Powder Coated Metal Sheets on my Garage and I used some Black Jack All Weather Roof Coating to basically seal a few leaks which it done very well however it seems to have 'washed' off in places but ok in others, been down maybe a year or so.

I know it's not a permanent solution but I have a tin left so would like to use it up so my question is, is there a primer or something to make it adhere better?

Thanks.
 

rvp

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Any ideas people other than ripping the whole thing off and starting again! which is not an option!!
 
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You probably have to use a primer on the sheets as they are very smooth sheets, and the coating is kind of anaerobic so it reduces the chances of moss growing
 

rvp

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You probably have to use a primer on the sheets as they are very smooth sheets, and the coating is kind of anaerobic so it reduces the chances of moss growing

Do you think Bitumen and flashing primer would work? Or Zinsser 123?
 
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