This is one project that seems to slip through the cracks when it comes to doing regular updates (original post, first update). The irony is that the more I forget about it the better the comparison becomes as I leave the test strip in the sun longer. This time it’s been 18 weeks since I first hung the test strip in a south facing window.

This weekend is probably the last one of the spring that will see the daytime highs staying under 100℉ (38℃). So before heading into the real Arizona heat, here’s a look at the progress so far.

May 28, 2016. Second comparison of test strips after 18 weeks of sun exposure in a south facing window.

May 28, 2016. Second comparison of test strips after 18 weeks of sun exposure in a south facing window.

I’m hard pressed to see much change. I would have to say even the 2-star rated Alizarin Crimson is holding up better that it’s rating would indicate.

For a side-by-side comparison, here’s all of the scans together.

All three scans to date, together for comparison.

Overall, I’m impressed. I expected a lot more fading by now. But summer is coming and the real test starts now. I plan another update in three months (the middle-to-end of August) and we’ll find out if the paint can take the heat.