Ratkity wrote:[SNIP]
Wait! That's a GREAT idea! There are magnets (not the cheapo sheet ones) that are very strong that you can use.[SNIP]
Hugs,
Ratkity
Being thrifty (or "cheap," as my family and friends call me), I've salvaged the magnets from hard drives from the odd dead computer. Those magnets, whilst ugly as all get out, will hold a small dog (as long as the dog stays fairly still ;-)...
Our attic fan needs covering every winter and I imbedded one of these drive magnets at each corner of my 1 1/2" foam cover (bed sheet covered, adhered with mis-mixed paint from the big blue box and finally coated with ultra white primer). Holds on like an unwanted house guest.
The magnets needed to be wired into and through the foam because they were too strong and wanted to pull the fabric free when I took it down for summer!
A thin plate of sheet metal, well adhered, covered and painted will be more than sufficient to hold the stronger magnets from the outside. Think of one of those magnetic CB antennas. The thickness of the adhesive and covering fabric will not significant diminish the magnetic force with these stronger magnets (magnetic force diminishes at a rate of the square of distance).
I'd suggest foregoing imbedding the magnets in the foam proper because they will want to take the covering fabric with them when you pull whatever it is you've stuck over them.
Regardless, this is an interesting twist on the foam creations...