WaiexB22 wrote:I have been busy working and I think its time for an update.
I need to seal up the flanges and seams in this duct work. I will use silicon flanges at the interface of the cowl, but I need a seam sealer for the corners and seams. Does anyone have a seam sealer or something equivalent that works well with aluminum? I was considering proseal, but I hate working with that stuff and it seams like overkill. I also thought about using HVAC tape, but I'm looking for something a little better than that.
BobDz wrote:Robert
Any chance you're within 200 miles of OSH? I'd really like to see your engine.
Thanks
karmarepair wrote:WaiexB22 wrote:I have been busy working and I think its time for an update.
I need to seal up the flanges and seams in this duct work. I will use silicon flanges at the interface of the cowl, but I need a seam sealer for the corners and seams. Does anyone have a seam sealer or something equivalent that works well with aluminum? I was considering proseal, but I hate working with that stuff and it seams like overkill. I also thought about using HVAC tape, but I'm looking for something a little better than that.
I've used high temp RTV for sealing my baffles and firewall, in some cases reinforced with fiberglass dry wall tape, and/or overlaid with aluminum foil, or aluminum foil tape. There are SINGLE PART moisture cure urethanes (look for Sika or PU Plus) and SINGLE PART moisture cured polysulfides (Boat Life) that are a little less mess than mixing ProSeal or other two part polysulfides.
My favorite trick is to cut a patch of aluminum foil the size and shape of where I want to seal, use a notched trowel to spread High Temp RTV on it evenly, squish two layers of fiberglass drywall tape at 90 and 45 degrees into the uncured elastomer, then "wet it out" with more RTV. Slap it on sticky side to the surface to seal. The slight stiffness of the foil and the tape holds the "membrane" in place pretty well, but you can also "fixture" it in place with Blue Tape. RTV WILL NOT cure (actually, none of the single part elastomers will....) in thick sections without tricks like adding cornstarch and teeny bit of water to it to carry moisture into the depth of the molding, but I've had no trouble with the technique just described.
Nice work, carry on!
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