Hi, I've got a customer who has just bought a house with side gates accessing the off road parking area. These are currently stained and he wants them painting. I've done a lot of painting over woodstain on interior jobs and I always use Zinsser B.I.N primer/sealer as a base coat. I've checked the Zinsser site and this sealer is described as suitable for spot exterior use, does this mean it's not suitable for sealing over woodstain on a larger area and if so what should I use.
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