Would this work on old Tempera Paint?

It works on water-based latex, so I'd think it'd work on tempera.

What’s the plastic strips for

Hello, I'm sorry I'm not quite sure what plastic strips you are referring to. I have closely examined the package and did not see any. I also went to manufacturer's page and looked for them, so I'm afraid I cannot answer that. You aren't required to use any, you just leave the lid of the paint off for several hours and then add the mixture and stir with a wooden stirrer and the paint then sets up for disposal.

How many are in this pack? 12 or 1? many of the reviews state it says 12 pack but is only 1.

Yes. The photo shows one plastic pack that hardens a gallon or so. For the $30 bucks or so, you get a cardboard box containing a dozen of them.

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Specifications

ASIN	B005NDILIW
Age Range Description	Adult
Best Sellers Rank	#402,442 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #957 in Interior & Exterior House Paint
Brand	Homax
Brand Name	Homax
Color	White
Color Code	See Label
Container Type	Can
Coverage	See Label
Customer Reviews	4.6 out of 5 stars 715 Reviews
Dry Time In Hours	0.25
Finish Type	Semi-Gloss
Full Cure Time	0.25 Hours
Included Components	Waste Away Paint Hardener, 12 pack
Indoor Outdoor Usage	Indoor
Is Waterproof	False
Item Form	Liquid Sample
Item Type Name	Waste Away Paint Hardener, 12 pack
Item Volume	19 Liters
Item Weight	4.3 Ounces
Manufacturer	Homax Corporation
Model Name	Not Available
Model Number	3535
Paint Type	Acrylic
Part Number	3535
Size	3.5 Ounce (Pack of 1)
Special Feature	Eco Friendly
Special Features	Eco Friendly
Specific Uses For Product	Interior/Exterior
Surface Recommendation	Metal, Plastic, Stone, Vinyl, Wood
UPC	782247221508
Unit Count	3.5 Ounce
Water Resistance Level	Water Resistant

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Waste Away Paint Hardener

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