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Polyurethane system adhesion problem on titanium

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We're having a bit of trouble with titanium parts, we're painting them with a wash-primer, an epoxy primer and a polyurethane topcoat. I suspect contamination from a sealant line but I also believe the adhesion is somewaht lower on titanium than it is on aluminium alloys. If you haven't guessed yet, I work on aircraft... and the titanium parts achieve high temperatures (around 150ºC should be common).

Thanks for any help.

Pedro de Oliveira Martinho
OGMA - Alverca, Santarém, Portugal

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