dhc3-t windscreen sealer...

[Fuel Boss Hog]

Looking to source some "Prestite" per the manual, in Canada. All windshield places are using urathane with much higher tensile strength.

Appreciate a Canadian source for the Prestite.

What is everyone else using?

Just doing an R & R for leakage control.

Thanks,

[Human Factor]

Contact Viking Air in Victoria (613-727-6556). They're the face of DeHavilland today and should be able to help you out. A good person to talk to there would be Dave Reese... he is a walking encyclopaedia.

[Fuel Boss Hog]

Contact Viking Air in Victoria (613-727-6556). They're the face of DeHavilland today and should be able to help you out. A good person to talk to there would be Dave Reese... he is a walking encyclopaedia.

Thanks for that - have yet to get an answer from them...one "I'll get back to you" and, another message left...ah well, I'll bug them again today

Any other thoughts out there?

TIA

[Human Factor]

Call and ask for Dave directly, you might have better luck.

For some reason, I remember using a PRC Semkit on Otter windows... B1/2 or something similar? It's been a while...

PS: Maybe place a call to Harbour Air in Vancouver... they're a big DHC-3 operator. I believe the DOM is Doug Hammerton there.

[brownbear]

The old sealant in the manuals will be long since gone.

All windows I have seen are installed with PRC. I just put in two windshields in my DHC-6 and used PRC 1422- B2

B 1/2 is 30 mins working time. B2 gives you 2 hrs.

Dave may know what they recommend now.

I'm sure the HA folk will have an answer.

The old methods are just that in most case, old and outdated.

[twotter]

You can use all kinds of things to seal your -3 windscreen. PRC is great until you have to take the windscreen out for a reason other than it's hooped. You will most likely break it on its way out. We use Sikaflex more often than not, it's a great marine sealant/adhesive that will not stick quite as good as PRC but seals just as good. It's also less than half the price.

[dashguy]

1422 is a fuel tank sealant that will hold a window in until you want to chisel it out. PPG/Desoto makes a window sealant called low adhesion PR1428-B2. It works good and is easy to remove without destroying the window and aircraft in the process.

[Fuel Boss Hog]

So, the scoop is that the only product Viking can/will officially recommend other than the original "Prestite" ( it's still available state side) is PR1776-B2. Still researching what forms it comes in but so far just a can and is appied with a putty knife ect...how tidy can that be? LOL!

I may go with the urathane product being used by windshield shops, at least it comes in caulking tube. The tensile strength is about 4 - 5 times the old {Prestite, req'd to hold in the windshields in the event of air bag deploy. Removal can be accomplished by cutting with a wire, apparently it skins off quite neatly as well after set to trim edges ect...

Appreciate discussion so far, any other opinions or ideas - I'd still like to find a roll of Prestite somewhere?

Cheers!

[ame abc]

get the prc in a sem kit just like a caulking tube (and it at least has a mil spec),you can get an application gun for around 50$ used. its only as messy as you let it be!and i would use the stuff that viking says seeing as how they have the type cert rights!

[twotter]

but does it have an approved mil spec? It's a god damned window in a non pressurized airplane, put it in with whatever works for you. And don't worry about it. All you are trying to do is keep the rain out.

[Ballsssssss]

Twotter knows what he is talking about..... PRC is overkill for a non-pressurized bush plane. I have seen a hundred Beaver windscreens installed with plain ol' silicone with no problems. I personally would use Sikaflex, it's a great sealant that works well and is moisture curing. Buy a case...you can use it for floats, boats, and sore throats.

[Wrench]

Every window i put in the twin otter i used prc 1428 b1/2. Its more plyable then 1422. I have also seen windows break because they are not properly gapped.

[Fuel Boss Hog]

so, exhausted the search and have come up with the real deal - "Prestite", UPS from Arizona in 3 days - I can work with that and I'll have the original product.

Here's the link for future reff - appreciate all the input. Sad to say the way our modern world has become - yes, lots' of stuff will work and be more than adequate, logic seldom prevails anymore.

http://www.acsource.com/index.asp?PageA ... ProdID=315

[chubbee]

If the MM says to use a particular structural adhesive for window installation, why not just use it?
The correct adhesive might help keep the window in place should a substantial portion of duck or other bird make it past the prop.

[Human Factor]

Not to mention keeping the aircraft conformed to its type certificate.

[Fuel Boss Hog]

FWIW and back to the original post, the MM calls for "Prestite"