The shape we think of first for spiderwebs. You'll probably find lots that look like this. Tangle Web Lots of house spiders make this kind of web. The poisonous Black Widow does too. If you live near woods, you'll see these hammock-like webs in the forest.
Some spiders are dangerous.
Remember you are looking for webs - not spiders. Look for webs around your yard, in corners of your house or at a park. Make sure there isn't a spider nearby. Spray the web with the paint. Be gentle so that the spray doesn't break the web.