Undersealing for Protection
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UNDERSEALING is a process by which a rubberized material, mixed to a semi-liquid form with a volatile spirit, is sprayed•from a gun on to the underneath parts of motor vehicles, so as to proteet them from corrosion.
, Being tough and resilient, it resists the constant bombardment of grit, stones and water. Another advantage is that it damps down panel drumming, and can be employed under bonnets, when it is used to a thickness of f in., tapering down to almost nothing at the edges. The normal thickness, however, is not more than
In the main, it is used to the greatest advantage on those vehicles largely comprised of thin sheet steel, in which rust may Cause loss of strength; in fact, Whole sections may be eaten away. It therefore seems particularly applicable to light vans and utility vehicles based upon present private-car .designs.
Efficiently done, the Undersealing process involves five stages: highpressure washing; high-pressure steam cleaning and brushing, with hot-air drying when necessary; a 'careful -check on nuts, screws, etc., which are to be covered; masking to confine the spray lug to where it is wanted; and spraying to the thickness required for protection and silencing.
The coating can be softened by heating if it ever, be necessary to use a spanner on nuts, or it can be cleaned off completely by The application of petrol.
"The Commercial Motor understands that the Post Office is a big user, all its private cars being treated in this way, whilst the US. Navy cars and utility vehicles in Britain are also Undersealed.
The weight of coating may be up to 50 lb. on a large car, and retail charges vary from £10 10s. for light vehicles to I:17 10s. for those corresponding to the large-car class.
The material is provided by The 3-M Co., Ltd., Arden Road, Adderley Park, Birmingham, 8, and was recently demonstrated by the London and Home Counties distributor, G. T. Riches and Co., Ltd., 19-21, Store Street, London, W.C.1, in conjunction with the North London service agent, the Central Motor Institute, Ltd., at its C.M.I. Service Station, Llanvanor . Road, Child's Hill, London, N.W.2.