Exterior finish systems have been available for many years which protect the broad expanse of metal structure from corrosion. These finishes have effectively protected structures of aluminum, magnesium, and steel. However, dissimilar metal couples and fasteners, which are sufficiently loaded during flight to cause the heads to move relative to the countersinks, generally have not been protected by the exterior finish alone. From a functional viewpoint, protection of these fastener areas is the most needed development for the exterior finish system. This requirement leads to the necessity for several critical properties, along with the traditional requirements of adequate adhesion, gloss retention after long sunshine exposure, ease of application, and resistance to polymeric degradation when exposed to humidity and the fluids used on the aircraft.

Subject
Surface finishing, Films, Water, Materials, Ions, Diffusion, Aircraft, Aluminum, Exfoliation, Polysulfides, Corrosion protection, Fasteners, Urethane
© 1973 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1973
Association for Materials Protection and Performance (AMPP)
You do not currently have access to this content.