Hi all,
I'm planning to freshen up the underside of my 9000 using the Bilt Hamber range of products and have a few general questions, and also questions for those that have used Bilt Hamber UB before:
I've just done this with my Mk1 MX5 using Dinitrol products but the 9000 has more in the way of rust scabs to deal with which gives me a few questions. My current thoughts are to wire wheel back all scabs to rid them of as much rust as possible. Where the metal is too thin/fractured/holed I will weld in new metal but I don't want to do this for every little bit of rust coming through unless necessary. For the bits that don't need welding: Deox-Gel, Hydrate 80, zinc rich/epoxy primer, UB underseal. As well as the scabs the entire underside of the car will be degreased and fresh underseal applied but I won't remove the factory underseal where it doesn't need it. The factory stuff on this late car is very similar to BH UB in that it's a very thin rubbery covering that doesn't lift and allow moisture creep like traditional thick underseal, so I'm happy to keep it.
1. For those that have used this before, how much UB do you estimate I'll need to cover the whole of the underside (the 9000 is 5-series sized for those that aren't sure)? I have a compressor but not sure what gun would be needed and conscious of cost. UB comes in 750ml aerosols or a 5 litre pail. Reviews of the UB suggest only 3 aerosols would be enough but I'm sure I used 5+ of the Dinitrol cans on the MX5.
2. What primer should I use for maximum protection? I've never been quite sure which between Epoxy for being non-porus or zinc rich primer for it's sacrificial layer properties. Or use both? I'd rather use aerosols for ease so epoxy would likely be 1k such as HB Body's aerosol. For zinc rich I'd either buy BH Electrox or I have a tin of Bondarust left (think that's zinc rich).
3. Would it be a good idea to paint over the primer with epoxy-mastic before applying the underseal? I've seen a lot of very enthusiastic opinions on both sides for this but without any reasoning for it being a good or bad idea.
Many thanks in advance
I'm planning to freshen up the underside of my 9000 using the Bilt Hamber range of products and have a few general questions, and also questions for those that have used Bilt Hamber UB before:
I've just done this with my Mk1 MX5 using Dinitrol products but the 9000 has more in the way of rust scabs to deal with which gives me a few questions. My current thoughts are to wire wheel back all scabs to rid them of as much rust as possible. Where the metal is too thin/fractured/holed I will weld in new metal but I don't want to do this for every little bit of rust coming through unless necessary. For the bits that don't need welding: Deox-Gel, Hydrate 80, zinc rich/epoxy primer, UB underseal. As well as the scabs the entire underside of the car will be degreased and fresh underseal applied but I won't remove the factory underseal where it doesn't need it. The factory stuff on this late car is very similar to BH UB in that it's a very thin rubbery covering that doesn't lift and allow moisture creep like traditional thick underseal, so I'm happy to keep it.
1. For those that have used this before, how much UB do you estimate I'll need to cover the whole of the underside (the 9000 is 5-series sized for those that aren't sure)? I have a compressor but not sure what gun would be needed and conscious of cost. UB comes in 750ml aerosols or a 5 litre pail. Reviews of the UB suggest only 3 aerosols would be enough but I'm sure I used 5+ of the Dinitrol cans on the MX5.
2. What primer should I use for maximum protection? I've never been quite sure which between Epoxy for being non-porus or zinc rich primer for it's sacrificial layer properties. Or use both? I'd rather use aerosols for ease so epoxy would likely be 1k such as HB Body's aerosol. For zinc rich I'd either buy BH Electrox or I have a tin of Bondarust left (think that's zinc rich).
3. Would it be a good idea to paint over the primer with epoxy-mastic before applying the underseal? I've seen a lot of very enthusiastic opinions on both sides for this but without any reasoning for it being a good or bad idea.
Many thanks in advance
