The "Mustard" Test

We're looking at some extensive repairs to an area which is called "Waterfall Number 2." That will include a new deck and bridge. One of several questions to be answered is "what decking material to use?"

I made a presentation to the board during the most recent association meeting, and gave them several samples of a "man made" decking product. This is, according to the manufacturer, of 95% recycled wood and plastic, and is suitable for installation in direct contact with the ground. Depending upon the actual product used, the warranty ranges from 20 years to "lifetime." As with all such decisions, the initial cost should be compared to "lifetime" benefits.  A principle goal is to reduce maintenance. That includes repairs and painting.

The product under consideration does not require staining; however, it will fade in color over time. It can be power washed, and if necessary, could be stained in the future. Who knows, in 20 years, the association might want to "spruce up" the deck.

An owner suggested that I do the "mustard test" to determine stain resistance. The material is stain resistant, but  is not immune or impervious to staining. So I decided to take one of the samples and subject it to the test.On March 10 I took a big dollop of yellow mustard and applied it, and allowed it to completely dry. I then washed the decking with plain water (no soap or scrubbing). The results are as follows:

After an hour, and allowing the mustard to dry completely:

I rinsed with warm water and allowed the sample to dry. Here is how it looked in artificial as well as daylight:

Notes:
 1. This wasn't a scientific test with controls, but it was adequate for my purpose.