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Old 06-21-2022, 12:44 PM
gmcjetpilot's Avatar
gmcjetpilot gmcjetpilot is offline
Join Date: Jan 2005
Posts: 4,833
Default Does Proseal Chemseal B2 TANK SEALENT STICK TO PLASTIC

EDIT: High-density polyethylene (HDPE) *tank materal*
I did try "plastic welding" using a solder iron. It worked mostly worked, looked good, but it seeps. Pin hole? Was not aggressive enough. This is where sealant comes in. I am going to try again.

As any builder knows proseal or tank sealant sticks to everything.

Will is work on plastic fuel tank? The sealant is primarily for metal, however if the plastic is clean, roughed up, it should stick?

ANY EXPERT OPINION (or wild guessing) Appreciated.
Raleigh, NC Area
RV-4, RV-7, ATP, CFII, MEI, 737/757/767

2023 Donation Made!

Last edited by gmcjetpilot : 06-22-2022 at 07:27 AM.
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Old 06-21-2022, 01:04 PM
terrye terrye is offline
Join Date: Feb 2010
Location: Vancouver, BC, Canada
Posts: 1,043
Default Does Proseal Chemseal B2 TANK SEALENT STICK TO PLASTIC

I installed my NACA plastic cockpit vents with proseal. Inside of aluminum skin was already primed and painted. I roughed up the mating surface of the vents with sandpaper prior to mounting. Not flying yet, but they seem to be permanently installed.
Terry Edwards
RV-9A (Fuselage)
2022/2023 VAF Contribution Sent
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Old 06-21-2022, 01:36 PM
RVDan RVDan is offline
Join Date: Jun 2012
Location: Frederick, MD
Posts: 995

Depending on the plastic, a primer may be required.
Dan Morris
Frederick, MD
PA28-140 sold
Hph 304CZ sold
RV6 built and sold
N199EC RV6A flying
Retired Aerospace Engineer and A&P/IA
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Old 06-21-2022, 02:26 PM
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9GT 9GT is offline
Join Date: Jan 2010
Location: Southern Michigan
Posts: 2,313

I used it many years ago to add vents to these new ventless “green friendly” plastic fuel cans that have those silly push down to open spouts that spill fuel everywhere but in the tank. I drilled out some brass and rubber tire valves, drilled mounting holes for them, then pro sealed them in. Replaced the spouts with old fashioned replacements you can still buy. Holding strong many years later and no longer have to fuss with non venting cans when I use them.
David C.
Howell, MI
RV-10: #41686 Under Construction/Sold 2021
RV-9A: #90949 Under Construction
RV-10: #40637 Completed/Sold 2016
Cozy MKIV:#656 Completed/Sold 2007
"Donor Exempt" but donated through Dec. 2023

Last edited by 9GT : 06-21-2022 at 02:28 PM.
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Old 06-21-2022, 03:09 PM
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BillL BillL is offline
Join Date: Sep 2007
Location: Central IL
Posts: 6,909
Default What specific material?

Some non-metallics would require flame passivation to allow a bond, then yes.

EDIT: Flame passivation is especially applicable to HDPE.

Last edited by BillL : 06-22-2022 at 06:23 AM.
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Old 06-21-2022, 03:50 PM is offline
Join Date: Jan 2017
Location: Battle Ground WA
Posts: 620
Default Proseal/plastic

YES Short answer
I have a 2001 RV-6A the other guy built.. He put the cowl pins in from the inside the cabin through the NACA vent. Bad idea
My NACA vents were both broken beyond repair, because of this failed trick. I used a heat gun to warm the Proseal and peeled them off with a putty knife. Glued new in place with more Proseal. 25 year old stuff to boot. no special prep either.
Never let go in 20 years. New ones are a year or so old. White airplane, so painted the vents black after installation.
Your luck may vary Art
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