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Large concave surface of inside of back on 1960's chair

Generally which type of foam would provide the strongest bond when glueing leather to it.

Which type of foam should be used on the concave surface to Give excellent adhesion.

My chair is the Orange fabric model standing outside in sunshine.
Could you please shed some light on which type of foam to use on the new job.
The outside back just has the thinnest layer of a cotton wadding between the fabric and the shell.
In your opinions could a very experienced upholsterer who has not done one of these chairs accomplish a perfect job once he has worked out the correct method/ techniques.
Thanks again from sunny Sussex.

Dear friends,thank you so much for your advice.Kodydog could you please tell me how the flat seating area under the cushion is anchored especially around its perimeter.
I am starting to get nervous about attempting this myself,Infact Today I visited a experienced professional upholsterer who has not attempted one of these chairs before.He does work for top London auction houses and high end dealers and he has worked a lot in leather but on traditional pieces.
He says the stitching is the easy bit of the job.
He inspected the chair a week ago and has spent a lot of time thinking about the project.He assures me he can accomplish the job to the desired level of detail.Its my decision but shall I let him have a go or give it to someone who has done one before.He assures me he would never return a piece to the customer unless it was perfect.
Your thoughts would be most useful.He has quoted me £1700 inclusive.

Wow,I like it.I don't think making a mould of the concave inside  would be practcal.Two very experienced upholsterers have said they could achieve the desired level of detail and they have never tackled one of these bug*ers before so they must have other ideas.
Could you just confirm that manual teasing stretching would not be possible.
Also how would the final glueing process be achieved.

The chair is currently in old moth eaten fabric.The original foam has turned to powder.The fabric is stuck to the foam which In turn is stuck to the fibre glass shell.
For your information the back of the back is stretched on wet and not glued.
I am not a upholsterer but intend to replace the foam and then recover it in 1.4 mm thick aniline leather after a considerable amount of research and even more practice.
These chairs are notoriously difficult to get spot on for obvious reasons.A OK finish is not a option it has to be perfect.
I am interested in mid century design and managed to fall on this piece for a few quid when it's value in leather is about £5000.
The best price quoted to do the job for me is £2000.
It is the convex side that is causing me many hours of thought on how it is accomplished.The chair is completely hand stitched.
Your advice is really appreciated.
Thanks.

I am attempting to recover a genuine Arne Jacobsen egg chair in leather.I am having difficulty getting the leather to conform to the front of the back (concave surface)any tips on how to shape and stretch the leather to avoid creases and the like.The link shows a finished example.Many thanks

http://i913.photobucket.com/albums/ac338/tricksumokko/image.jpg1_zps1vgu2ee3.jpg