Join Date: Oct 2012
Location: Lancaster Co. PA/ North East, MD
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Re: Another headliner question...
THe mastic will set in a relatively short time. While it's doing that. yo umust "clamp" the piece with a piece of flexi=ble material, like small dimension plywood, by bracing with "spring-boards, to the opposite bulkhead. Something like a scrap piece of door stop or rip of 1X material. Slightly longer that the dim to the other side; ya just bend it a tad in the middle and let it spring\back once in position. The pressure of the "bow" will hold the piece of backer pressing the carpet to the mastic. THis is/was std proceed when glue lamming formica like tub/shower surrounds. Give it at least 24 hours and yer GtG.
While not heated/cooled, the interior space still does go thru cycles. The interior will remain cooler in the morning compared to the outside amd at night, the exterior will cool faster that he interior. Perhaps not much; but enuff to cause condensation if it's damp enough. If possible, leave a WX protected vent open to equalize/normalize temp/humidity.