The short answer
Lab tests — mostly commissioned by the manufacturers — show treated shingles regaining flexibility and holding their granules measurably better in the short term. There is no long-term, independent field study proving the headline "adds five years" claim, and the shingle manufacturers' own association formally advises against these treatments. Our verdict: a reasonable, modestly-priced maintenance bet on a sound roof — not a proven life-extension guarantee, and never a substitute for repair.
What the lab tests show
The most-cited testing was done by PRI Asphalt Technologies and Ohio State researchers on 17-year-old shingles, for Roof Maxx. Reported results:
| Measure | Reported result | Note |
|---|---|---|
| Pliability (ASTM bending tests) | Treated shingles passed tests that untreated aged controls failed | Short-term, measured days after treatment |
| Granule loss | ~46% less granule loss after treatment | Lab abrasion/weathering protocol |
| Permeability | ~60% improvement | Company-reported summary of lab data |
| Hail impact | Dent size ~24% smaller | Simulated impact testing |
SoyLei's APEX-1132 chemistry has its own file: PRI laboratory reports (2020, 2021, 2024) and a peer-reviewed paper in the International Journal of Asphalt Technology (August 2025) covering flexibility, granule adhesion, impact and flame spread. That is a higher evidence standard than most of the category offers — and it is still the manufacturer's own research programme.
The case against — from the shingle industry
In a technical bulletin dated 24 July 2026, ARMA — the Asphalt Roofing Manufacturers Association, whose members make the shingles — stated that it "strongly advises against the field application of any type of coatings or rejuvenators over installed asphalt shingles." The bulletin notes that many manufacturers do not recommend field treatments, raises questions about fire classification and building codes, lists reported problems including curling and granule loosening, and says documentation of benefits is limited. No major shingle manufacturer endorses any rejuvenator.
Read it yourself: ARMA bulletin, asphaltroofing.org. Context cuts both ways: manufacturers sell replacement shingles, so a product that delays replacement is not in their commercial interest — but their warranty and fire-rating concerns are real things to weigh, not noise.
What nobody has proven
- The 5-year figure is a warranty construct, not the output of a decade-long field trial. Independent reviewers (e.g., Roof Observations) rate the treatments "partially effective": the short-term gains are real, the long-term outcome data does not exist yet.
- Insurance: no insurer is known to "reset" a roof's age after a treatment — carriers date a roof from its last full replacement. A treatment may keep a roof insurable-looking and sound, but do not buy it as an insurance-age fix.
- Warranty: because manufacturers advise against field treatments, check your shingle warranty's wording on unapproved applications before treating a roof that is still under warranty.