It isn't heat that breaks down the chemical bonds in the vinyl, its UV. Sunlight is deadly for plastic. I laugh at "lifetime warranty" vinyl siding -- there's no way, without a coat of paint (which defeats its purpose) that it won't get brittle and crack. For real fun, leave a plastic toothbrush in the sun all day. I was using an old one to scrub car parts once. By the end of the day it was so brittle that the handle crumbled into dust. Whatever formulation is used for toothbrushes can't handle UV at all. Sunlight also "bleaches" color out. In an older car the upholstery exposed to sun is faded as well as cracked. It also turns plastic light lenses cloudy. That's why I use car covers as well as dashmats (which also become brittle from sunlight exposure and need to be replaced every 5 years or so). Bill Robertson #5939 >--- In dmcnews@xxxxxxxxxxxxxxx, "John Hervey" <john@...> wrote: > > Farrar, be careful that the mats don't act as a coat and it gets hotter > under them and dries the dash out quicker. Also watch for any chemicals in > the matt doesn't bleed onto the dash. I had to get rid of mine because of > this even though the backing has large pores and it will breathe easy. It > was a Dash Mat also. Don't get me wrong they are good, but just watch out. > John Hervey > www.specialtauto.com > www.deloreanautoparts.com To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/