In CA it is illegal to charge for shop supplies.
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The “used” shop supplies must be shown on the original estimate. This pretty much means shop supplies will be included unnoted in the original estimate.
What I've experienced here in the east is you can be charged for "shop supplies". What goads me is that they can use just a little bit of what comes out of a tube or spray can but charge you for the entire tube or can that they can reuse 12 other times.
I once had a slow leak fixed where I purchased a set tires from a relatively new tire store that had been in business for about a month. I also purchased a "tire guarantee" that stated could get flats fixed for free. So I bring the vehicle over 3 yrs later and thinking I was leaving with "no charge". Nope...they charged me $10.50 for "shop material fee." $25 to dismount and remount the tire and an additional $20 to re-balance the tire.
The tire warrantee cost me an additional $125. There I was having to pay about an additional $55 for the "fix flats free guarantee".
When I questioned the bill I asked "what is the shop fee for" and they told me they had to use PB Blaster on the lug nuts. Upon which I stated "so a 900 ft lb impact couldn't do that? And they said "yes but we sprayed the lugs to get them on more smoothly and we used tire lube to get the tire back on the rim"
Then I said, "what happened to the "free tire fix"? They said "the tire fix was free" "We didn't charge you for the patch or the plug or the labor to apply those items".
So in my typical fashion I don't argue with stuff like this. I simply give choices. The choice I gave them was to either rescind every single charge on the bill or I'd take all of my tire business elsewhere seeing I'd already paid them for the tire flat fix guarantee. They stated they would accommodate me.
They then reduced the bill to $10.50 for "shop fees". When they presented me with the new "bill" I said "so this is what you really want?"
They said they "have to charge shop fees" no matter what as per management edict.. So I paid them the $10.50 and as I left I said "this is the last time I darken your door."
They just stood there and I never received an after call from "management".
So they have been doing business like this for the last 3 yrs and I can only assume they have treated every flat fix customer this same way since. The place is always "mobbed" with customers so I guess others have just "shrugged" and paid whatever they wanted.
They must be doing something right but I'll never know because I'll never experience this company again.