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[johnnydog]

Depends whether you use a 100% RTV or what is known as an Extended Sealant. In other words, a quality sealant adhesive, or a cheaper silicone that is mixed with certain oils, therefore reducing its adhesive, shrinkage, and weathering properties.
I have only used the red high temp RTV on exhaust joints, instead of crap exhaust cement.
The adhesive / sealant I have used on any retainer was used very sparingly, and only sufficiently to hold it onto the screen where it had partially lost its hold. Whether it is classed as RTV, I dont know, but there was no mention of RTV on the tube. But it is a top quality  product and ideal for the use I required it for.
I have never mentioned a 'poorly' fitted screen, or refitting broken retainers, and certainly not 'filling' the retainer. The retainers I have refitted were always intact, but possibly not quite as tight fit onto the edge of the screen as when new, hence the sparing use of Adiseal - a bit pointless refitting retainers if they were broken or damaged
When we get old in life, we may need the help of a walking stick; the same as 20 + year old retainers that may little help to stay in place if needed. I can't actually see the problem to be honest....

[Doctor Gollum]

I used the description 'rtv' as a generic flexible sealant/adhesive. 

[johnnydog]

A bit like saying all engine oils are the same.....

[Doctor Gollum]

Devon and Cornwall could have used bath sealant on it for all that anyone knows

Knowing Mutha and his cars, doing it right matters. That notwithstanding I stand by my opinion.

[johnnydog]

Which you are entitled to....
An opinion is......just an opinion.
Which doesn't mean viable alternatives to effect a repair shouldn't be carried out. On many older cars, alternative methods of repair are often done without compromising safety or the quality of the actual repair.

[Mutha Jugs n Speed]

Thanks to all of you...for the advice, certainly food for thought.The screen in question is probably not the original being an ex cop car,but I've had the car for sixteen years and the screen hasn't been changed in my ownership,and the exterior trim was sun damaged, frayed on the edges and sticky to the touch,hence the welcom freebie. I'm now sort of regretting not thinking this one through.....Autoglass man said ''simple job''and it was certainly easy removing the old one.....jar of worms come to mind at the moment....with the limited options

[johnnydog]

A new genuine VX goalpost moulding was around £59 from Autovaux delivered, whereas the best price I managed to get from Vauxhall when I got my last one was around £67 - and I had to pick it up. It is in a big cardboard package to keep it straight and it won't easily go into the average saloon car.
One of the reasons the upper moulding doesn't sit right is that te profile of cheaper aftermarket screen isn't perfect. If they sit right at the bottom they protrude at the top and vice versa. I only know this from a replacement screen I had a few years ago. Also the correct amount of bonding adhesive needs to applied so that the screen sits at its correct depth in the aperture relative to the bodywork. Again, from experience of a cheap screen replacement / fitter.

[Mutha Jugs n Speed]

Makes me wonder wether the scrap moulding was fitted correctly in the first place,although the groove was pretty free of dirt etc ,and didn't put up much of a fight when taking it off.

[Doctor Gollum]

That's why the fit of the corners is so important... The moment any air gets under the trim in the corners, it simply slides straight out of the sides.

Will the old trim refit for the time being? It's only cosmetic so no matter if it won't 

[Mutha Jugs n Speed]

Unfortunately, it was toast and got binned,no worries think I might be able find the odd car to use in the meantime.

[Doctor Gollum]

Indeed

Some judicious use of black insulation tape will keep the channels covered up for the time being

[Mutha Jugs n Speed]

May well set a trend

[johnnydog]

My local breakers has about 4 Omegas in at the moment. I would have thought the goalpost trim was one of the last things to go and would probably get crushed eventually with the rest of the car. Due to their size postage is the obvious issue, but would it not be worth a check on any of your local breakers? As long as the trim isn't cracking at the corners and is sitting nicely on the donor car surely it has to be worth a punt? Can't see them asking a fortune for a rubber part.

[Doctor Gollum]

There is a lockdown 

[Kevin McG]

I bought a new outer goalpost rubber for my 3.2 only to find out that you can’t just replace it. You have to take out the screen and place new rubber in situ and then refit all in one. I found this out just last week and it wasn’t a cheap job,but it looks amazing now