Billy.Whizz Posted February 13, 2021 Share Posted February 13, 2021 Does anyone underseal their C7, I'm thinking more about the mudguards/ wheel arches as I understand that the glassfibre versions are prone to star cracking on the top side due to stones being thrown up from the underside, so I'm thinking a good coating of underseal would provide a bit of a cushion, also what about underside panels and fuel tank. Thanks.Bill. Link to comment Share on other sites More sharing options...
Benton Posted February 13, 2021 Share Posted February 13, 2021 Used U-POL Gravitex plus on wheel arches. Horrible black sticky gooey stuff to apply but a couple of coats does the job! Wouldn't want it on the floor or fuel tank though. Link to comment Share on other sites More sharing options...
Wrightpayne Posted February 13, 2021 Share Posted February 13, 2021 Its good to get some wax between the ally panels and steel chassis - dinitrol or bilt hamber is good. Hot day and tin in boiling water aids ingress! Link to comment Share on other sites More sharing options...
timb2117 Posted February 14, 2021 Share Posted February 14, 2021 I used a rubberized roof spray for inside guards, I had a horror moment when I looked over my almost new carbon guards with a torch and you could see daylight strips through them where stones had obliterated the surface! Lucky I got to them before it cut right through...In reality I think any heavy duty underseal will work. When I had the tank off I noted two worn parts either end that were exposed to road schrapnel so treated that too on the front and underneath edges. Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted February 14, 2021 Leadership Team Share Posted February 14, 2021 A backpacker's foam sleeping mat works well, cut to the appropriate shape and glue in place. Stu. Link to comment Share on other sites More sharing options...
Leadership Team Toughie Posted February 14, 2021 Leadership Team Share Posted February 14, 2021 Like Stu above, on my first 7 I bought some 5mm neoprene which I stuck on the inside of the wheel arches for protection from stones.Someone suggested Isoflex because they'd heard that neoprene just traps water behind it. I'm trying the isoflex on this car, but even put on thick, it doesn't give me confidence about the degree of protection from stones. Link to comment Share on other sites More sharing options...
7 wonders of the world Posted February 14, 2021 Share Posted February 14, 2021 A couple of coats of this works well:https://www.diy.com/departments/isoflex-black-roofing-waterproofer-0-75l-tin/35462_BQ.prd?storeId=1202&ds_rl=1272379&ds_rl=1272409&ds_rl=1272379&gclid=EAIaIQobChMIwa-Tr-Hp7gIVKoBQBh2uSw_ZEAQYBCABEgL15vD_BwE&gclsrc=aw.ds Link to comment Share on other sites More sharing options...
Area Representative paul richards Posted February 15, 2021 Area Representative Share Posted February 15, 2021 Sleeping mat. Link to comment Share on other sites More sharing options...
ScottR400D Posted February 15, 2021 Share Posted February 15, 2021 Nothing underneath a strip of helicopter tape next to the carbon guards. In 6 years I have one small star chip from underneath and a few small paint chips. I always thought I’d have had the wings off and resprayed by now but hopefully they’ll do for another few years before anything’s noticeable. Link to comment Share on other sites More sharing options...
rayjackson1950 Posted February 15, 2021 Share Posted February 15, 2021 Thsi is a job I want to do and after a lot of searching, have found Wunderseal, from Car Builder, see link below. I haven't got mine yet as I doing other odds & sods at the moment. https://www.carbuilder.com/uk/wunderseal-underbody-sealer Link to comment Share on other sites More sharing options...
Billy.Whizz Posted February 15, 2021 Author Share Posted February 15, 2021 Thanks chaps, I like the idea of using the isoflex as it's a rubber product and I can also use it to repair my flat roofs.Bill. Link to comment Share on other sites More sharing options...
Alan Reeves Posted February 16, 2021 Share Posted February 16, 2021 Flashing, Bostik Flashband.Used it on two cars and no star cracks, heat it and it sticks under the wings well. Sounds agricultural but...it works Link to comment Share on other sites More sharing options...
pugwash Posted February 16, 2021 Share Posted February 16, 2021 I sprayed a couple of coats of stoneguard. Seems to have done the trick. Link to comment Share on other sites More sharing options...
L66TEY Posted February 16, 2021 Share Posted February 16, 2021 This thread is great timing - as I've just got new arches back from having been vinyl wrapped and was thinking how to best protect and prevent the starring (the reason for getting new arches was loads of starring on the originals from 2010). Think I'll go with your recommendation Alan. With thanksChris Link to comment Share on other sites More sharing options...
Billy.Whizz Posted February 16, 2021 Author Share Posted February 16, 2021 Would flashband not be a bit heavy? Link to comment Share on other sites More sharing options...
L66TEY Posted February 16, 2021 Share Posted February 16, 2021 Fair point - I guess Colin Chapman wouldn't be a fan. Based on quick calcs it would add circa 600g overall. Link to comment Share on other sites More sharing options...
L66TEY Posted February 21, 2021 Share Posted February 21, 2021 Reply to #15Billy, You got me thinking.... Flashband is clearly on the heavier side than "normal" stone protection, eg PPF. Which makes me wonder whether PPF could be fitted to the inside of the wheel arches???Chris Link to comment Share on other sites More sharing options...
Billy.Whizz Posted February 21, 2021 Author Share Posted February 21, 2021 #17. Chris it Would require a lot of cutting and shaping and getting it to stick properly, I would prefer to paint something on which also can seal joints and then just touch up when required.Bill. Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted February 22, 2021 Leadership Team Share Posted February 22, 2021 Weight ...... a very good reason to try a section of closed cell foam sleeping mat Stu. Link to comment Share on other sites More sharing options...
L66TEY Posted February 22, 2021 Share Posted February 22, 2021 Reply to #19 Hi Stu. Yes, have to say Im now leaning more towards the sleeping mat approach. But what glue is used to adhere the closed cell foam to the arch? With thanks Chris Link to comment Share on other sites More sharing options...
Leadership Team SLR No.77 Posted February 22, 2021 Leadership Team Share Posted February 22, 2021 A few beads or blobs of Sikaflex or Tigerseal and it won't be going anywhere.Stu. Link to comment Share on other sites More sharing options...
L66TEY Posted February 22, 2021 Share Posted February 22, 2021 Reply to #21 Thank Stu. Change of plan - I'll now be taking the Flashband back to Screwfix and picking up some Sikaflex instead :) Link to comment Share on other sites More sharing options...
Billy.Whizz Posted February 22, 2021 Author Share Posted February 22, 2021 I'd be careful which sleeping mat you select as I've tested pieces from three different budget types and they all soak up water. Link to comment Share on other sites More sharing options...
TomB Posted February 22, 2021 Share Posted February 22, 2021 How about some self adhesive neoprene from eBay? Link to comment Share on other sites More sharing options...
L66TEY Posted February 23, 2021 Share Posted February 23, 2021 Reply to #23Hi Bill,Good point about the waterproof element of the mat. I've decided to give this one a try for £7Chris Link to comment Share on other sites More sharing options...
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