Help! Acrylic on canvas. Waterproof it?

[tzuhouse]

I have painted a sign on some canvas (painter's tarp) that will go in front of our Webelos den leader's home on den days. Our boys are the Dragon patrol, so the sign has a cave and the dragon's eyes in the cave are glow-in-the-dark paint. I need to seal it with something so that if it rains, the paint won't get destroyed.

I thought about spraying both sides with a clear spray paint. I thought about modge podging the whole thing on both sides.

Then I decided to come to those who probably know exactly what I should use. This sign is probably 5'x4', so it's fairly large.

Thanks in advance for any advice!

Mary

[Imzadi]

Modge Podge isn't strong enough. Go to an art supplu store or craft store and buy a clear acrylic sealer. They come in sprays or jars. In the jars they look a little milky, but dry clear. Use a 3" large foam brush ( that looks like a squeegee) to apply it, so you won't get streaks.

[tzuhouse]

Thanks! I bought an oil-based spray yesterday and am continuing to put coats on it. If I don't feel it's protected enough when I'm done, I'll brush some clear sealer on it.

Mary