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Shellac Primer on top of Oil Primer, and vice versa?

810 Views 3 Replies 4 Participants Last post by  Rad Dezign
Is there any reason not to use a shellac primer over an oil primer if you have extra of one but not the other and need to finish a job?

For instance, Bin on top of SW Extreme Block (oil), or vice versa?
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Interior or exterior? What is your purpose for double priming?
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