I have old junk trailer I triple brushed HF $50/gal bed liner (had to stir after every 3rd brush dip to keep texture suspended). Trailer was very rusted so I brushed with phosphoric acid, rinsed off, then blower dried, then brushed liner on. Did that 11-12 years ago and still looks good. Would NOT acid wash maverick. Not sure I would use HF liner on it but would highly recommend practicing on old trailer or piece of metal roofing with at least some flat areas. Maybe his looked the way it did because it rained on it before it was completely cured????
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