On plastic that's been lightly sanded it wouldn't be needed. The primer is used to provide a grip for the paint and cover flaws. With plastic there will be enough of a grip on the roughened surface to hold the paint.
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Ian Christopher
2001 Kawasaki Ninja 250R - Mostly stock
(Suzuki SV650 coming soon)
1967 Dodge Polara 500 - Heavy mods
1984 VW Transporter - Stock
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