Well i feel really blessed to live where i do in Midwestern USA. It is not that i never have
any problems, but it is nothing nearly so severe as what some of you describe here. Like Hardati (welcome to the forum BTW
) i also like to have access to my collection so most of it is displayed around my study, though i do keep them all sheathed as for me it is the best thing to do. I do store some in singeps as well and trade out on occasion to have new keris "on view" from time to time. Rust and mold has not been much of a problem for me over the years. I did have some wood (or at least the fine finish) crack on one of my sheaths one winter, but for the most part everything is fine. I try to oil the entire collection regularly and keep the wood clean.