{"product_id":"bilt-hamber-dynax-ub-underbody-anti-corrosion-wax","title":"Bilt Hamber Dynax UB | Underbody Anti-Corrosion Wax","description":"\u003ch2\u003eWhy not just use underseal?\u003c\/h2\u003e\u003cp\u003eBecause bitumen underseal cracks. It goes on thick, it dries hard, and the first stone that hits it opens a fissure. Water gets behind the coating, and now you have a sealed, dark, damp pocket against bare steel — which is a better corrosion cell than no coating at all. Every restorer has peeled back underseal and found a horror show underneath.\u003c\/p\u003e\u003ch2\u003eWhat Dynax UB does differently\u003c\/h2\u003e\u003cp\u003eUB contains \u003cstrong\u003eelastic polymers\u003c\/strong\u003e that produce a tougher, more abrasion-resistant film than a conventional wax — but it stays a wax. It flexes. It doesn't crack, and Bilt Hamber state it \u003cstrong\u003ewon't peel\u003c\/strong\u003e. It's touch-dry rather than tacky, so it doesn't stay a dirt magnet forever, and it carries Bilt Hamber's metal-seeking corrosion inhibitors into every seam it reaches.\u003c\/p\u003e\u003cp\u003eIt's a solvent-borne aliphatic hydrocarbon system — Bilt Hamber's SDS declares C7 hydrocarbons and hydrotreated heavy naphtha as the carriers. The wax itself and the inhibitor package are not disclosed, so we won't invent them.\u003c\/p\u003e\u003ch2\u003eThe numbers that matter\u003c\/h2\u003e\u003cp\u003eTarget film thickness is \u003cstrong\u003e80–100µm\u003c\/strong\u003e — noticeably heavier than Dynax S50's 50µm, because an underbody takes physical abuse a cavity doesn't. Build it in \u003cstrong\u003eat least two coats, 24 hours apart\u003c\/strong\u003e. One heavy coat is not the same thing and will not cure properly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCoverage:\u003c\/strong\u003e Bilt Hamber state roughly \u003cstrong\u003e4 × 750ml aerosols to treat a medium-sized vehicle\u003c\/strong\u003e, or \u003cstrong\u003e1 litre per 8–10m²\u003c\/strong\u003e brushed or sprayed. Buy accordingly — running out halfway through an underbody is a miserable afternoon.\u003c\/p\u003e\u003ch2\u003eHow to use it\u003c\/h2\u003e\u003cp\u003eSurface must be \u003cstrong\u003edry\u003c\/strong\u003e. Degrease first — \u003cstrong\u003eSurfex-HD\u003c\/strong\u003e is the right tool — rinse and let it dry properly. Brush, roller or spray. Two coats minimum, a day apart. Around 24 hours to dry at 15°C.\u003c\/p\u003e\u003cp\u003eCold wax is thick wax. Bring it up to about 15°C for 24 hours before you start.\u003c\/p\u003e\u003ch2\u003eAn honest note on the test data\u003c\/h2\u003e\u003cp\u003eYou'll see Bilt Hamber's 2000-hour University of Hertfordshire salt spray result quoted across the internet for the whole Dynax range. \u003cstrong\u003eThat study tested Dynax S50 only.\u003c\/strong\u003e Bilt Hamber separately claim UB outperforms competitors under ASTM B117 conditions, but they publish no report for it. We're not going to lend UB a result it didn't earn.\u003c\/p\u003e\u003ch2\u003eHandle it properly\u003c\/h2\u003e\u003cp\u003eAerosol: \u003cstrong\u003eDanger — H220, H280, H304, H315, H336, H411.\u003c\/strong\u003e Ventilate, no ignition sources, wear respiratory protection when spraying overhead.\u003c\/p\u003e\u003chr\u003e\u003cp\u003e\u003cstrong\u003eSafety Data Sheets (Australia)\u003c\/strong\u003e\u003cbr\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0669\/0707\/8878\/files\/Dynax-UB_SDS_au.pdf?v=1784380297\" target=\"_blank\" rel=\"noopener\"\u003eDownload the Dynax UB SDS – bulk (PDF)\u003c\/a\u003e\u003cbr\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0669\/0707\/8878\/files\/Dynax-UB-Aerosol_SDS_au.pdf?v=1784380297\" target=\"_blank\" rel=\"noopener\"\u003eDownload the Dynax UB SDS – 750ml aerosol (PDF)\u003c\/a\u003e\u003c\/p\u003e","brand":"Bilt Hamber","offers":[{"title":"750ml Aerosol","offer_id":48433207050462,"sku":"BH-Dynax-UB-750ml","price":55.0,"currency_code":"AUD","in_stock":true},{"title":"5L","offer_id":48433207083230,"sku":"BH-Dynax-UB-5L","price":165.0,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0669\/0707\/8878\/files\/750ml-Dynax-ub.jpg?v=1784179133","url":"https:\/\/www.alphadetails.com.au\/products\/bilt-hamber-dynax-ub-underbody-anti-corrosion-wax","provider":"Alpha Details","version":"1.0","type":"link"}