Good rule, never let any work leave the shop that you haven't been compensated for. It saves so much in hard feelings.
And a companion rule; People need incentives.
Rich

I had gone to a machine shop to have engine work done and the invoice noted shipping for ordered parts as a separate charge. Why not, it's a cost.
I don't know what you charge for labor, but add that to the cost X2 for the materials. Then add the shipping. Also, since leather is not uniform like vinyl, there's more waste so add about 10% on the SF amount.
A customer who asks for leather should be able to afford it.
Oh, and very, very important, when you give the quote, look like you mean it, most customers are smart enough to catch a wavering stance. It says, I can be haggled with. Like when your girlfriend says no, but it doesn't show on her face, the guy always takes that as an opportunity to press the issue.

If it's general exposure to vinyl that's the cause, then I suppose I'd have to look for a non-vinyl alternative, or take an early retirement.
Rich

Update;
After checking different sites on the internet, I found something from Uniroyal, the makers of naugahyde, that stated that vinyl should not be heated over 175d F. I heated a scrap to the point I usually do for stretching around a panel and found it had gotten yo 210d. Then I tried limiting the heat to 175 and I was able to work with it, but since I hadn't been heating any vinyl for about two weeks prior and my skin condition was clearing up, this brought on a new outbreak. So now, if I absolutely must heat vinyl to any temperature, it will be with a full face mask a a supplied air pump.
Rich

Thanks for the replies. Certainly, we are all living under conditions we cannot escape without taking very extreme and unrealistic measures. Toxins are in our air, water, food, cleaners, you name it.
My question was aimed at uncovering anyone who might have had physical effects that they suspected were caused by exposure to the materials we work with.
In the work I do, (dental chairs) the materials I use have to be those the original manufacturer used in order to match, so safer alternatives aren't an option.
Rich

Hi Nadeem,
I've been speaking with Jim Adams and he said he would take them.
Thanks for asking.
Rich