Spot fillers

Knifing, Spot and Spray Fillers for Metal and Marble (here also coatings). Knifing and spot fillers are especially suited for filling large areas of unevenness in just a few operations in quick succession. Knifing resins (hard to flexible) are mixed to a paste-like consistency with the extenders described. Benzoyl peroxide and tertiary aromatic amine are used as the hardener system (the latter is usually a component of the resin supply form). 

For a complete panel replacement, the refinisher starts with a panel preprimed in the appropriate stoving primer. For spot repairs or larger repairs without replacement of metal, there will be areas which have to be rubbed through to clean metal. Any indentations then have to be filled with a stopper or spray filler, probably based on unsaturated polyester resins and styrene, with cure initiated by mixing in an organic peroxide. After sanding, remaining bare metal areas are sprayed with a two-pack etch primer. 

In order to accurately determine the speed of the flash-across phenomenon, the experiment was repeated and recorded by streak camera with color film. Also thinner SPHF plates were used. In the streak camera trace, 8.5 (isec after each initial wave entered the NM, a hot spot appeared at the surface of each plate and flashed to the center of the chge each at the phenomenal speed of 35 mm/fisec. Cook (Ref 3) considers the flash-across phenomenon to be the heat pulse predicted by M.A. Cook, R. Keyes A.S. Filler (Ref 1)... 

Diam of cartridge is 3.45-inches and its length 32.05-in. The front of cartridge is closed with a funnel-shaped cover, which carries a tube extending thru the center of the tube to the partition separating expl filler from spotting chge (Ref 51a, p 5-31)... 

Observations of the affected materials under the light microscope has shown that it is a microbial contamination, and the black spots are located on calcium carbonate particles (fillers) and rice hulls fibers. In some cases, the black substance covered calcium carbonate or rice hulls particles completely. 

The metals are joined by spot welds and rivets that may cause electric currents in the Joining areas. Specially designed epoxy primers prevent corrosion in these areas. At ambient temperature epoxy primer fillers dry thoroughly in about 16 h. Since this is too long for assembly lines, they are normally cured in ovens (80 metal temperature). 

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