Compostos solúveis em superfícies a serem pintadas.

Soluble compounds on surfaces to be painted

Introduction
The presence of soluble compounds in a surface that will be painted can interfere with the performance of coat or paint system.
The interference depends on the amount and type of contaminant.
The most common are the salts.
The most critical environments are those industrial, where there are large number of factories that emit polluting gases in the atmosphere like SO2 and the maritime where there is presence of salt spray intense.

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http://www.abraco.org.br/site/uploads/revistas/arquivos/edio-completa-40-ano-9.pdf