I wouldn't do it. The tape will lift at the sides at some point then come apart from the paint

XUPAI2PCS Premium Self Adhesive Caulk Strip Waterproof Caulk Tape White 1.5" x 10.5Ft Caulking Sealing Tape for Kitchen Sink Seal Toilet Base Bathroom Bathtub and Wall Edge Protector

XUPAI2PCS Premium Self Adhesive Caulk Strip Waterproof Caulk Tape White 1.5" x 10.5Ft Caulking Sealing Tape for Kitchen Sink Seal Toilet Base Bathroom Bathtub and Wall Edge Protector

Q: There's not enough adhesion promoter for use with the full length of tape. what is it? can i buy more anywhere?

I'm not sure, but I would guess that more adhesion promoter may be available on Amazon or Home Depot. But I agree, one tiny little packet containing one tiny little pad is not nearly enough.

Q: Is the tape rigid enough to stand up for half its width if I stick it to a interior window frame to form a light barrier under the pulldown shade?

I'm sorry, but I don't know the answer to this question, since I did not use the tape for this purpose. It was used as caulk in the shower, and it did not last very long, even though the instructions were followed. It was very easy to apply but started to pull up after about 2 weeks in the shower area.

4.2/5

Product ID: 526872191

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⚡Easy peel & press

💧Waterproof adhesive

🛠️1.5in x 10.5ft size

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Description

Seal the deal with style! 🛁✨

QUICK REMOVAL - Easily reposition or remove without hassle.
FAMILY SAFE MATERIALS - No unpleasant odors, ideal for home use.
VERSATILE APPLICATION - Perfect for sealing bathtubs, sinks, and more!
USER FRIENDLY INSTALLATION - No tools needed—just peel, press, and go!
UPGRADED ADHESIVE TECHNOLOGY - Stronger stickiness for lasting results.

The XUPAI 2PCS Premium Self Adhesive Caulk Strip is a versatile and user-friendly sealing solution designed for various applications in kitchens and bathrooms. Measuring 1.5 inches wide and 10.5 feet long, this waterproof caulk tape features upgraded acrylic adhesive for superior stickiness and easy installation. Perfect for families, it’s odor-free and can be applied without tools, making it an ideal choice for quick home improvements.