Master Flame Class A Fire Retardant Spray for Wood, Fabric, Cotton & More - Non-Toxic Flame Retardant Coating - Meets NFPA 701 & ASTM E84 - Made in USA - Easy to Apply and Dries Clear - 1 Gallon

Before spraying this on a piece of plywood that I wanted to protect, I sprayed it on a big piece of corrugated cardboard. Which is what I use as kindling to start fires. And then I tried to light it with an Aim & Flame. It did not burn. I don't know how it works, and it's a tad pricey, but if you want to make something fireproof, this stuff seems to get the job done. I also mixed it with some primer on another project (which they say you can do). Made the paint thinner, which I expected. But then it started to really thicken up after awhile, like Thompson's waterproofing product. I applied it, and it went on fine, but a little grainy. I assumed from this that it has some active ingredients that really harden surfaces and paint. So I think this was a good buy. If it ever has to stop a fire, it's a great buy.

Did a test on an old piece of wood. It seems to really work. Remember it is a fire retardant not fire proof

Used this as a seal coat on wall framing , sheetrock and wood trim. I made treated and untreated samples of the framing wood, sheetrock and painted wallpaper on sheetrock. They were tested by the local fire department. The untreated samples burned easily, but the treated pieces were difficult to burn.

Flame tested and this product is great. Sprayed with HVLP gun on seat material and wool product. Will not burn even with constant fire by blowtorch.

Couldn’t be easier to apply, covers a lot of area thoroughly. Haven’t tested its fire resistance however. Appreciate that the chemicals don’t seem particularly dangerous to work with.

Sprayed this on the bottom of my utility closet walls in hopes to prevent any fire. Do I need to re-apply at some time intervals??

It works for us

I bought this to mix with paint to paint my exposed basement posts, beams, and joists. I mixed a full gallon of this with a little less than a gallon of latex paint. I did a couple tests on some scrap boards first, and it didn't work when I first tried it, but I missed the part about waiting 24 hours. Tried it again the next day and board turned a little brown, but would not burn and hardly even smoked. This seems to work exactly as described and is way better than nothing. I used a small foam roller to apply this to the exposed wood in my basement, to give it a nicer finished look, while adding fire protection without having to wrap everything in a bunch of drywall. This product makes the paint super thin and watery, and it drips EVERYWHERE, so I ended up masking things off almost as much as i would have if spraying. Also, because of how thin it is, it takes many many coats to achieve a uniform opaque color. I think I did 5 coats before I couldn't see the old paint colors where some of the wood had been painted decades ago. This product also separates from paint really easily, so you have to keep mixing it throughout your project if using very much. It probably separates as much as 90% after sitting for just an hour, and after being left overnight I could probably pour the Master Flame back into the bottle, leaving the paint behind. I'm glad i found this product as it's saving me from having to wrap things in metal or drywall, and gave me justification for painting the entire basement ceiling (instead of just the areas that were previously painted blue, green, or cream. I used up the first jug and just bought another, I'll probably need a 3rd to finish the entire project, it's an 1100sf basement with 100 year old wood that sucks up the first 2 coats of paint. I took 1 star off for how thin it makes the paint and how quickly it separates. It would be nice if they had a thickening agent you could add or they could get it to bond with the paint.

Thank you for this excellent product. It is very light and easy to apply, and the wood absorbed it completely without leaving any residue. The material was tested using the ignitability test according to BS EN ISO 11925-2:2020, and it performed very well.