I can attest, my LE will have dimples when I open the hangar doors to go flying, all it takes is 10 minutes in the warm sunlight, by the time I am started up, found my earplugs, and ready to climb in, the leading edge looks like I just covered it yesterday. With warmth they retreat, with cold they appear. It indeed seems contrary to common sense, however I wonder if maybe the nose ribs expand/contract at a greater magnitude than the skins? Doesn't seem right but that is all I can think up at the moment... I would love to hear any other wild theories, maybe somebody can bring some light to why the wood seems to contract in heat/humidity and expand in cold/dry.
Maybe an interesting note, I installed my skins on a hot and humid day, thinking about expansion and dimpling, thinking that the skins, if anything, will dry further preventing dimples until I could get them varnished. It wasn't 48 hrs from the day I applied the nose skins that the first dimple appeared. :/ Chipped my pride as up to that point I thought I made some pretty nice looking wings... she still flies so beggars can't be choosers! Out of curiosity has anyone applied the "D" skins in relatively cool dry climate? Curious to their experiences with dimpling compared to mine.