PROSOCO FastFlash | Waterproof and Airtight Fluid-Applied Flashing Membrane - Trusted by Professionals

Prosoco R-Guard Fast Flash (and related Joint & Seam Filler) works as described to seal the gaps between different building materials. Tape and caulk products aren't all-purpose as liquid flashing products, where you apply a large bead in bulk, and then spread as needed for the situation. Corners, odd shapes, vertical, horizontal, works equally well inside tight spaces as it does across large flat areas. You can push the liquid flashing into cracks in the same way that caulk is applied, plus you spread it out with a plastic fin or other spreader tool. Cleans up easy with paper towels before it dries. The finished product is a rubberish mastic that provides a permanent barrier to water, air and insects.Cure (drying) time is dependent on humidity. If you're working in a very dry environment (e.g. below 50% humidity), a small amount of water misting with a spray bottle will speed things up. I'm in central Texas and find most days that I can spread the joint and seam filler in the morning, and then after lunch apply the fast flash. On especially dry days (humidity below 30%), I'll very lightly mist the substrate before applying the joint and seam filler. A great benefit, rain isn't a worry - you can apply these products and not worry about rain later in the day!The joint and seam filler is pink and reinforced with fibers, designed to fill large gaps between material, goes on very thick and the finished surface isn't as smooth/flat in comparison to the fast flash.Fast flash can be used by itself, or on top of the joint and seam filler. Dark red in color, nearly the same product as the joint and seam filler, but less fiber reinforcement to allow being applied as a thin top-coat that finishes smooth and sexy!Applied successfully at the foundation between concrete and base angle (e.g. sill plate) for metal buildings, workshops, and barndominiums. Works great for commercial and residential construction across a wide variety of materials!

This stuff is good. Easy to work with, but don't do a big area at once, it will tack up easy. Drys rock hard. My only downside is the price, one tube doesn't go very far.If you have a big budget or a small job this stuff works great. Big job small budget! You're going to be let down.

this sealant is surprisingly easy to use and creates a thick and pliable seal around complicated forms. It does have a tendency to drip from overhead surfaces if it is put on too thick. Use the plastic spreader or a chip brush to smooth it out immediately. Use plastic drop cloths, wear gloves, and a work clothes that you don't mind ruining.

It's not cheap, but it does a great job. It dries to a hard rubber consistency which worked really well to flash the tar paper around our windows. We flashed the rough opening first, to seal the tar paper to the OSB, and then flashed a second time after installing the window itself.

I use this to cover/seal around windows. Works great . Its the only thing I found to seal the black gypsum board or whatever it that they used on old houses.

Bond will last a lifetime.Probably the best product on the marketWill tolerate weather changes and most movement if applied thick enough.Is not low costRequires appropriate sized gunDifficult clean up.Once cured, it will take great effort to remove from any surface (not even a power washer will work)Red color not aesthetically pleasing for exposed work.

Product is great!Shipped quick.

Works, but a little spendy. Need to sell a 2, 3, 4 pack for cheaper or something