Paint makers Sherwin-Williams (SHW) and RPM International (RPM) hit new highs Thursday in another signal that the home-improvement trend is swinging into high gear. Earlier this week, Home Depot (HD) and Lowe’s (LOW) reported better-than-expected earnings, sending them rocketing out of bases into new high territory. Sherwin-Williams reported earnings July 17, sending the stock up nearly 5%. It pulled back and has since resumed its advance.