Originally Posted by jen b
I covered mine with 1/8 inch closed cell foam to which I'd spray-glued automotive headliner fabric. It looks great. It is sagging. I haven't entirely figured out how to beat gravity.
I used super-duty sticky-back velcro strips, but I'm finding they are separating from the ceiling - though the rest of it is sticking together okay. I have supplemented with both hot glue and OSI Quad. It's not actually falling-on-my-head sagging, but gapping in enough places to be annoying.
Jen b. -- I may have finally found something that will work to adhere the self stick velcro to the headliner material. AFTER I used the same velcro, I saw your posting and sure enough the same thing started happening to my headliner. After several days of experimenting with who knows how many products, including the 3M Hi-strength 90 spray stuff, I saved the one that actually worked for last.
I did not want to use this type stuff since it had taken me more than a week, with a hammer and chisel, to get it off the ceiling as the PO went crazy with "Liquid Nails". This stuff is a little different than LN and since it was not going to have direct contact with the fiberglass, used it. The application conditions couldn't have been worse, temps in the 90s, storms with heavy rain every day, unreal humidity and all that. So far so good.
Evenly coat the area that the velcro goes onto the material but avoid side oozing as you will need to weight
it down for about 24 hours for drying time to bond. I used long strips of wood and blocks to hold it down. No more edge puckering on the material and is still plenty flexible to make the curve in the ceiling. Might want to give it a test run on a scrap piece of your material. BTW, I did mine in 2 sections with them joining just beyond the roof vent area. This material I got is not as heavy as it may look plus I bonded a layer of reflective insulation on the back of it. Insulation doesn't go all way to the edges, left room for direct contact of the velco to the material.
The rear piece is in and the front area is going under the blocks today.
If you get this sealant and use only a small amount for a test run, tape up the end of the tube and store it in the freezer and it won't harden up keeping you from using again it later.
Hope this helps, jd