CarCareTruth Score
Decent, but it's tough on the environment.
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Prices may varyThe manufacturer's Safety Data Sheet classifies this product with one or more GHS Category 1 health hazards — the most severe tier. The hazard statements in quotes below are the verbatim GHS language from the SDS, as required by OSHA's Hazard Communication Standard. The line under each statement translates the GHS classification into plain language.
GHS Category 1 aspiration toxicity — thin, oily liquids can slip into the lungs if swallowed, causing chemical pneumonia.
If swallowed, inhaled, or splashed in eyes:
Call Poison Control immediately at 1-800-222-1222 (US, 24/7, free) and have the product container with you. Poison Control's standing guidance is to not induce vomiting after chemical exposure; they will direct first-aid steps based on the specific product.
About this product's hazards. This product's Safety Data Sheet uses signal word danger. Read the manufacturer's SDS and follow all safety instructions before use. CarCareTruth ratings translate the manufacturer's safety sheet. They do not replace the SDS or substitute for a hazard assessment specific to your task.
Health score is for adult use as intended, per the manufacturer's SDS. It does not model child ingestion, accidental spill cleanup, or off-label use. See the safety panel below for full hazard classification, and /disclaimer for the full editorial scope.
GHS hazard codes are quoted from the manufacturer’s Safety Data Sheet. PPE tiers below translate those codes and the listed ingredient chemistry; they are not CarCareTruth recommendations.
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From the manufacturer’s Safety Data Sheet, Section 8
“No H318 or H319 in SDS §2 mixture classification. Aerosol mist near face level is the primary eye exposure pathway.”
— Royal Purple
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
From the manufacturer’s Safety Data Sheet, Section 8
“H317 (Skin Sensitization Cat 1) confirmed in SDS §2 mixture classification · repeated dermal contact warrants protection.”
— Royal Purple
U.S. regulatory standard
29 CFR 1910.138(a); 1910.132(d)
“appropriate hand protection when employees' hands are exposed to hazards such as those from skin absorption of harmful substances.”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
From the manufacturer’s Safety Data Sheet, Section 8
“Aerosol form factor creates fine mist near face level. H335 absent from §2 mixture classification; enclosed-space aerosol mist is the inhalation exposure trigger.”
— Royal Purple
U.S. regulatory standard
29 CFR 1910.1200(f); 1910.132(d)
“The employer shall assess the workplace to determine if hazards are present, or are likely to be present, which necessitate the use of personal protective equipment.”
OSHA standards apply to workplaces. Cited here as the U.S. reference threshold for the underlying hazard class.
CarCareTruth publishes the cited sources verbatim and does not advise what action a user should take. Consult the full SDS before use.
No PPE specified in published sources for ventilation. Absence does not imply “not needed” — consult the full Safety Data Sheet.
PPE tiers translate the manufacturer’s SDS and U.S. regulatory standards. Not professional safety advice. How we report safety.
This product ranks #5 of 15 in Penetrating Oil / Multi-Purpose Lubricant.Three above it ↓
Last reviewed June 12, 2026
TL;DR DANGER-rated aerosol with a Prop 65 warning · the SDS classifies an aspiration hazard if swallowed and a skin sensitization risk from the carrier. Owners rate it highly on Amazon, confirming reliable penetration on light-to-moderate rust in 10·20 minutes and above-average re-seizure protection from the named synthetic additive package.
Maxfilm wicks a synthetic petroleum carrier into corroded threads to break the rust's grip. Owners report penetration on light-to-moderate rust in 10·20 minutes from a single application; heavy rust typically requires a second coat. The disclosed corrosion inhibitor and antiwear additive package · both named in the SDS · stand out from standard petroleum-only competitors and support re-seizure protection above the category median. Royal Purple claims ASTM B117 100+ hour salt-spray protection on the manufacturer page; no independent replication was found.
A solid choice for a homeowner with occasional stuck fasteners who wants a synthetic formula with more residual corrosion protection than a straight petroleum-carrier spray. Skip it for frequent enclosed-space use · DANGER classification and a confirmed Prop 65 warning are documented SDS hazards that compound with repeated aerosol exposure.
DANGER driven by an aspiration hazard if swallowed and skin sensitization from the carrier. Do not induce vomiting if ingested · seek medical attention. Skin sensitization (H317) at the mixture level in SDS §2; SDS §8 specifies gloves for repeated contact. Aerosol mist in enclosed spaces is the primary inhalation pathway · no H335 respiratory irritation code appears at the mixture level. Prop 65 warning on the product listing. Environmental: petroleum-distillate carrier, not readily biodegradable, two aquatically toxic ingredients, one bioaccumulative ingredient per SDS §12.
Owners consistently report penetration on light-to-moderate rust in 10·20 minutes with a single application. For heavily corroded fasteners, most owners apply a second coat after the first dwell period and allow an additional 15·30 minutes before attempting removal.
Royal Purple's product page does not publish a compatibility list for rubber or plastics. The petroleum-distillate carrier can swell or degrade some rubber compounds and certain plastics with prolonged contact. Avoid saturating rubber boots, seals, or plastic clips · direct the straw precisely and wipe away overspray.
The SDS §2 mixture classification lists H304 (aspiration hazard if swallowed) and H317 (skin sensitization). DANGER is driven by those two classifications. The Prop 65 warning appears on the product listing; petroleum-distillate carriers with trace aromatic content are a common trigger even when named substances fall below individual reporting thresholds.
The formula uses a synthetic base oil and includes named additives · a corrosion inhibitor and an antiwear agent · that are disclosed in the SDS. Most commodity penetrating oils use straight petroleum-distillate carriers without a disclosed additive package.
Marketing copy from Royal Purple, via Amazon. Not editorial.
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