21 replies to this topic

[whistler]

I've brazed the wing to scuttle gap up before for someone who wanted a smooth joint between the two. It's took a couple rods each side but did a lovely job of smoothing the seam. The big plus of brazing rather than welding was that if the wing ever needed replacing you could just melt the braze out of the joint. 

 

One down side is the heat, although you can control it to avoid distorting anything it will take off paint within 2-3 inches. I found a paint gun with a long nozzle and a bit or wax oil inside the scuttle void  was required after wards. 

The other downside of brazing is that it can crack over time.

[minidaves]

should be welded on the underside, and seam sealer just tidies the job

[CityEPete]

Holy thread revival batman!

[tiger99]

They sometimes came out of the factory brazed, in the days when the press tools were in good condition and the joints fitted properly. The top of the A panel was also brazed to the scuttle.

Properly done, braze is ok, but protect it from electrolytic corrosion and don't let the MOT tester see it. Bronze weld, on the other hand, is also good, and stronger than braze, but the cost of a spool of MIG bronze is horrendous.

Last one I did was welded underneath and a spot of MIG between A panel and scuttle, as it had come out of the factory that way.

There are several satisfactory ways of doing it.

[WanaGo]

Thread revival number 2 ! lol

For those who seal the gap up between scuttle and wing, with a flexible sealant, do you do it after you paint so the sealant is visible and not body colour, or do you do it before paint and obviously use a paintable sealant?
I am unsure what way to go, as the sealant isnt body coloured and might look a bit weird, but if I paint over it and its flexible, the paint might crack or something while the sealant moves.

What is the correct answer here? 

[StefanMini]

You need to put on the sealant first, and after that you paint it. You can put paint on almost every body sealant.

[sonikk4]

From the factory they come with nothing in there, however after i weld the scuttle return to the wing return underneath and also add the little reinforcing bracket to the A panel to wing flange. I then flood the gap with primer and topcoat, then once that has hardened off i force sealant in as far as possible keeping a nice low finish in the gap then paint again. ( isal on the underside as well.)

 

My go to sealant is PS870B1/2 which is an Aviation sealant which copes with extreme temperature ranges and also has an anti corrosion mix in it as well. It's not cheap if you try to buy it. I use shelf lifed from work.