Preservo Paint & Coatings Manufacturing Co., Houston, is celebrating its 50th year of operation this year. The company was started in 1951 when founder Robert H. Schneider expanded his cedar-shake and stain plant into a full-line paint-manufacturing facility. The company said it has been a supplier to the aerospace industry since its start, and manufactured products used in spacecraft in the early days of the U.S. space program. The company, now headed by Robert G. Schneider, is in the process of building a new three-acre facility that is scheduled for completion by the end of this year.