It's been a fairly flat year for chemical manufacturer RPM International ( RPM). With its now-4.12% dividend yield factored in, the firm's similarly sized price drawdown year-to-date is essentially zeroed out. RPM's core business is manufacturing chemicals used in the construction business -- well-known names such as DAP and Rust-Oleum are a key part of the firm's product portfolio. Not surprisingly, that exposure to construction has proven challenging for RPM in recent years. Shares are still down from the levels that they reached in early 2008. Despite that depressed share price, dividend investors should be aware of this name. After all, RPM is one of the few companies out there that can boast more than 37 years of consecutive dividend increases. A sound balance sheet should help that trend continue for the foreseeable future, even after last week's 2.4% dividend increase. RPM is one of the top-yielding chemicals stocks.