MaxDiesel Posted February 11, 2019 Share Posted February 11, 2019 I've been attacking the 'hell hole' under the battery tray on my 914. In the process of cutting back to solid metal I've created an opening in the top of the main longitudinal where I can look up and down the sill. The good news its its solid - but there is surface rust on the inner surfaces. Before I weld up the longitudinal I'd like to treat the rust while I have access (Once all the welding's done I'll also be using Wurth cavity wax). What products have people used ? I'm ideally looking for something I can spray down inside the sill. I found this product on eBay that seems to fit the bill: https://www.ebay.co.uk/itm/2x-CARLOFON-Pro-Rust-Converter-Rust-Protector-and-Primer-Spray-400-ml-111/263560570981?epid=9016844312&hash=item3d5d6f2865:g:DYIAAOSw~T9aVeA6 Anyone used this ? Thanks Matt Link to comment Share on other sites More sharing options...
Nige Posted February 11, 2019 Share Posted February 11, 2019 That looks decent stuff, as with most of this stuff I've found it best if you follow the instructions to the letter. Link to comment Share on other sites More sharing options...
SP72 Posted February 11, 2019 Share Posted February 11, 2019 Bilt Hamber have a cavity wax in their repertoire I believe Link to comment Share on other sites More sharing options...
R2D2 Posted February 11, 2019 Share Posted February 11, 2019 Bilt Hamber are very good - maybe call them, very helpful team there. Fertan Rust Converter is also excellent and leaves an inert "primed" surface which can then be waxed. Link to comment Share on other sites More sharing options...
Busybee Posted February 11, 2019 Share Posted February 11, 2019 Dinitrol ML with their fan spray head adapter. Sets like a wax but creeps into seams. I’ve used it everywhere on my 912 project Link to comment Share on other sites More sharing options...
osc911 Posted February 11, 2019 Share Posted February 11, 2019 Rust.co.uk have a cavity wax with rust inhibitors which is pretty good (will post link when on computer).For your application, would you not sandblast first to get rid of the surface rust blotches? Problem is that it normally starts from the inside and works out, but you may get lucky since you've caught it early.Maybe sandblast, then use epoxy primer or just go straight to POR15.Sent from my Pixel XL using Tapatalk Link to comment Share on other sites More sharing options...
Aspro Posted February 11, 2019 Share Posted February 11, 2019 You want to use a rust converter before any cavity wax or the like is applied. Yes cavity wax alone will slow down the rusting process but it’s best to treat it beforehand. I highly recommend Dinitrol or Bilt Hamber products. Link to comment Share on other sites More sharing options...
MaxDiesel Posted February 13, 2019 Author Share Posted February 13, 2019 Thanks for all the recommendations. In the end I've ordered two cans of Dintrol RC900 Rust Converter with an extension hose to get along the sill. All the reviews of the Dinitrol stuff seem to be very positive - I'm still struggling with the idea of paying ~£60 for 2x 400ml spray cans though!! I'll let you know how it goes. Link to comment Share on other sites More sharing options...
mean in green Posted February 13, 2019 Share Posted February 13, 2019 Wow, is that how much it is now? Sure I paid £120 for a box of a dozen mixed aerosols from them - albeit some time ago! It’s good stuff. Out of curiosity I put the chassis wax in the wheelarches of a work van in 2009. Most of it was still there last year. Waxoyl would’ve been long gone. Link to comment Share on other sites More sharing options...
Nige Posted February 13, 2019 Share Posted February 13, 2019 (edited) I've fill all my cracks, crevices and holes with Dinitrol ML. Still not cheap but a couple of cans do go a long way. https://www.ebay.co.uk/itm/Dinitrol-ML-Penetrator-Rust-Proofing-Cavity-Wax-500ml-Aerosol/382170614990?hash=item58fb24ccce:g:FMUAAMXQwKdRfKo5:rk:2:pf:1&frcectupt=true Don't know that the difference is (thicker I think) but this version looks better value: https://www.ebay.co.uk/itm/4-x-DINITROL-3125HS-RUST-PROOFING-CAVITY-WAX-500ml-AEROSOL-Extension-nozzle/223226232284?hash=item33f951fddc:g:U2cAAOSwbjNcRaqB:rk:14:pf:0 Edited February 13, 2019 by Nige Link to comment Share on other sites More sharing options...
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