What primer(s) or basecoat(s) should be used on the surface where foams are to be applied?
What will be an ideal response?
Because structural foams are typically epoxy based, an epoxy or urethane primer is the most desirable Thus reducing the chances of incompatibility between the products. While acid etch primers are not the best choice, they can be used provided they are fully dried or cured before the foam is applied. One must be aware of possible corrosion forming at a later date is also possible as acid etch primers tend to attract moisture.
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