Factory audit
AskFor a live walkthrough of the coating line and the slitting area, not a showroom tour.
Red flagOnly a warehouse and a sample wall.
EvidenceA dated video walkthrough and the plant address printed on the invoice.
Before you approve a quotation, find out which of the paint protection film manufacturers on your shortlist actually coat their own film, and which of the paint protection film suppliers simply resell rolls they never made — because that answer decides who can honestly stand behind the warranty on your order.
A manufacturer extrudes or coats the film and controls the substrate and the adhesive. A converter buys bulk rolls, slits them to width and re-labels them. A trading company resells other people's rolls without owning a line. Only the first can commit to a named TPU grade, a named adhesive and a warranty in its own name — so the label on the roll, not the price list, tells you who you are talking to.
Published by Guangzhou Tongli Film Co., Ltd. — integrated TPU PPF manufacturer, trading under the TopW and TLPPFILM brands, with a 10-year warranty on the photochromic paint protection film line.
Seven questions, three answers. Read the row you care about across all three columns, then send that row to every vendor on your shortlist and ask them to say which column they sit in, in writing.
| Check | Trading company | Converter | Integrated manufacturer |
|---|---|---|---|
| Substrate sourcing | Buys finished rolls; the TPU grade is rarely disclosed | Buys broad rolls from one or more mills and slits them | Coats TPU in house and can name the grade it runs |
| Adhesive origin | "Imported glue" with no supplier name | Sometimes states a country, seldom a brand | Names the adhesive on the spec sheet — the photochromic line lists USA Ashland |
| Coating & roll labeling | Generic re-label; spec sheet is often a screenshot | Label shows width and length only | Roll label and spec table carry thickness, adhesive and coating detail |
| OEM / private label | Rarely possible | Possible at volume, with negotiated labels | Supported through the customization and TopW Dealer Crew programs |
| Minimum order | Smallest quantities, highest unit price | Medium, priced by slit width | Structured by project — confirm trial quantity with the sales team |
| Warranty issuer | Third-party or none | Converter's own name, backing unclear | Issued in the maker's name — 10 years on the photochromic line |
| After-sales responsibility | Complaints forwarded to an unnamed factory | Converter handles, factory negotiates | Manufacturer handles the claim end to end |
Buyer decision: if a vendor cannot name the TPU grade and the adhesive, treat the warranty as a marketing line you would have to pay for yourself.
Run these seven checks before you send an RFQ. Each one takes a single email, and each one produces a document you can hold a supplier to later.
AskFor a live walkthrough of the coating line and the slitting area, not a showroom tour.
Red flagOnly a warehouse and a sample wall.
EvidenceA dated video walkthrough and the plant address printed on the invoice.
AskWhich TPU grade is used, and is it aliphatic or aromatic?
Red flag"High-quality TPU" with no grade named.
EvidenceA written grade statement — the TLPPFILM line states genuine Lubrizol TPU.
AskWhich adhesive is laminated, and who makes it?
Red flag"Imported adhesive" as the whole answer.
EvidenceThe adhesive name on the spec sheet — the photochromic line lists USA Ashland.
AskFor a photo of the label on the actual roll you would receive.
Red flagA polished PDF spec sheet with no roll label behind it.
EvidenceA photo of the core label showing thickness, width and film type.
AskIs the mil figure measured with adhesive and coating, or TPU alone?
Red flagDescription and table disagree — the photochromic page itself lists 6.5 mil / 7.5 mil in the table while the description reads 7.5 mil.
EvidenceA gauge reading on a sample from your production lot.
AskFor a sample cut from the same lot as your order, not from a demo roll.
Red flagA hand-cut swatch mailed with no lot number.
EvidenceInstall one panel, then check edge adhesion, water beading and scratch recovery under warm water.
AskWhose legal name appears on the warranty document you pass to your customer?
Red flag"Warranty provided by the factory" with no name or terms attached.
EvidenceWritten terms — the photochromic line is backed by a 10-year warranty.
A PPF roll is a stack of layers, and every layer is a line item in the price you are quoted. The label should tell you what is inside before you cut it open.
Buyer decision: if the label names no adhesive and no TPU grade, the anti-yellowing and 10-year claims are the supplier's marketing, not your transferable warranty.
Five buyer scenarios, five different specs. Start from the row that describes your business, then use the decision column as the first sentence of your quote request.
| Scenario | What matters | Shortlist | The decision |
|---|---|---|---|
| Detail shop adding a colour-change upsell | Finish variety and clean removal | Photochromic and colour series: Rose Pink Diamond, Rose Green Diamond, satin fiber and gloss | Stock two finishes, not five, and confirm residue-free removal before you promote it to high-value paint. |
| Distributor selling into hot and cold climates | Temperature window and cracking resistance | Clear TPU PPF on a hydrophobic coating | Put the rated range in the RFQ — the photochromic line is listed from -40°C to +140°C. |
| Private-label brand building its own line | Consistent lots and your own roll label | Colour, gloss and satin base films | Agree roll label, lot code and warranty wording before the first pallet, not after. |
| Motorcycle, bike and marine shops | Kit coverage and edge adhesion | Gloss hydrophobic grades with edge seal | Check kit coverage for the exact models you service — the range lists bike, motorcycle, yacht and aircraft use. |
| First-time importer testing the category | Honest labeling and a real sample | One clear film plus one colour film | Order a sample from the production lot, install one panel and judge the roll before a container. |
Unit price in this category is set by the layers inside the roll, not by the discount on the price list. Compare two quotes only when they describe the same substrate, adhesive and coating.
Buyer decision: no list price and no fixed MOQ are published for this line — the buy path is a quote request. Ask what a small trial quantity looks like at your width before you discuss annual volume.
Keep adjacent product options together for a faster catalog comparison.
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Ensure long-lasting durability with our 7.5 mil matte TPU car wrap film. Ideal for car wrap wholesale, it offers self-healing, UV protection, and quality.
View productfactory audit, aliphatic tpu verification, adhesive brand confirmation, coating and adhesive labels on the roll, the thickness claim against the spec sheet, a sample roll test, and who actually issues the warranty. each point is meant to be answered with evidence rather than a verbal assurance.
the roll label and the spec table should carry the thickness, the adhesive and the coating detail. a label that shows width and length only, or a spec sheet that is a screenshot, is a signal to ask for the documents behind it.
the photochromic line is listed from -40 degrees c to +140 degrees c, so the rated range belongs in the rfq rather than in an assumption. cracking resistance and edge behaviour across that range are what installers live with after the roll is cut.
the tpu substrate grade and whether the grade is named at all, the adhesive (a branded lamination costs more than an unbranded one), the coating package of hydrophobic, anti-yellowing and thermal-repair layers, the finish, and the roll width and length that decide wastage on a full car. order volume, packaging and whether your brand goes on the roll are priced on top.
start with a sample kit and install one panel to test edge adhesion, water beading and scratch recovery, then take a single-lot trial roll for a handful of paid jobs. move to production quantity only after the roll label, the warranty issuer and the packaging are agreed in writing.
stock two finishes rather than five, and confirm residue-free removal before promoting a film to high-value paint. the matching rule on this page follows the work a shop actually does: colour and satin films for coverage, gloss hydrophobic grades with edge seal for kit work.