I'm in Minnesota, we had a cool summer and I keep the temps pretty cool in the winter. No problem yet with the cap. I do keep an eye on them. They are the newer high temp edition ( 70 C about 160F ) Hopefully they will do fine. I had a friend make me new bases out of maple, he has all the necessary tools, which I do not. The top plate is painted with model aerosol paint. ( British metallic green, MG green? ). Maple it turns out is hard to satin, it took several attempts-resandings,to get it even.