Great to find all this information! Thank You!
Staining 480' 2 yr old PT deck in high sun in Boston Ma that was built directly over a rubber roof. Have an additional 3 level PT stairway (treads & railings) and 140' deck where rubber is not an issue.
Question: Original choice was an oil stain - Penofin recommended by the guys I trust - for the saturation and durability of oil. Research on Naptha and Xylene (primary ingredients of any petroleum distillate) - show a highly detrimental rating to rubber. Yikes!
The application technique - brushing on and then wiping off any non-saturated surface collection seems pretty safe if done carefully - but it is a new rubber roof and I am happy to be careful and cautious.
Does this then lead me to choose a water based stain? In following your site Defy seems to get very high ratings - but is there another I should pursue?
A follow up question: I like the gray of the seasoned decking - and was hoping for a semi-gray transparent stain to unify the seasoned and sun-saturated decking with the still slightly PT yellow/green of the stairway. Thompson's was the only one I could find that offered a gray stain color - but I have seen a lot of bad reviews of this product , and the test was lackluster and unimpressive.)
Can I add a gray pigment to the Defy to get a transparent grey to create a uniform treatment between deck and stairway?
Or - is the answer to treat with a transparent Defy and come back in 3 years with a more pigmented stain when I am ready to shift red/brown for a colored deck?
Thanks for your great help with these questions!
Defy would be a good choice for this and it does come in a Driftwood Gray color. You could also use their Clear and allow it to gray naturally. You cannot tint the Defy products with your own colorant.
Thanks for the reply and great news about defy driftwood gray. I did not see this as a color choice when looking at their product.
Am I right however about not applying oil stain to a deck above a rubber roof?
Second question: Am I also compromising quality and longevity in working with a water based vs oil stain?
Third: if Defy is the best decision, does it make sense to go with a semi transparent coat of the gray, and then plan on working to a solid coat when I next treat the deck?
thanks for your thoughts and expertise!
I do not think an oil based stain will harm the roof but it depends on what the stain manufacturers say.
Not really. Both oil and water can be good if using a quality stain.
Don't use a solid. They do not soak in and are prone to peeling.