Zinsser Bullseye or Coverstain

[crossconstruction]

Hi,
Just a quick one. We repaired and painted (both weathershield undercoat and satinwood) an old external bay window and we have some stains which have bled through.
When internal we have used B.I.N before and its worked great, however it states not suitable for external.
So question is, would coverstain be the way to go? Or is B.E 123 worth a look. And would these need the satin to have a quick sand to give a key?

Cheers in advance
Ryan

 

[opps]

If you have BIN already, it is ok for exterior spot priming.

The fact that you have stains bleeding through kinda demonstrates that you might have been better off using the oil based version of Dulux Trade Weathershield in the first place.

Sorry, that wasn't supposed to be snarky but oil based paints do not allow water based stains to leak through and have greater longevity.