Q fur profeshinull bodyshop peeps

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The Mad Hat Man

The Mad Hat Man

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Having almost finished (yup almost there) the welderising on my disco. with Zintec and Galvo sheet. I need sum professional help.

I got the speshul metals primer to use before I hammerite the noo plates. I also got ooodles of seam sealer.

Now - do I seam seal before i primer or after primering, but before the top coats.

The intention is to Hammerite, Underbody shultz and then waxoil everything in site.

Can anyone give me some pointers?
 
Yes prime it all then seam sealer it then top coat ! :)

rust can start under the seam sealer other wise, just look at a ten year old jap motor ! :D
 
while working at a body shop we used to apply the seam sealer to the bare metal then prime over that. if you prime the metal first it can allow damp to penetrate the primer coat getting under the seam sealer where as cleaning the metal surface seam sealing it then priming it you are reducing the chance of moisture travel through the primer also the exposure time of the bare metal. if you apply the seam sealer with a short bristle paint brush making sure the 'seam' you are covering is well coverd this will prevent oxygen getting to the metal thus causing rust.
never use silicone based sealer as it contains chemicals that will hasten the rusting process and cause the metal to rot away very fast.
 
Im no pro but the way I did mine was to seam seal the bare metal (Plenty of it) Then prime and paint then wayoyl then gearbox oil... In fact anything oily I could lay me hands on:lol:
 
I've never known anyone seal over a primed surface IF they had had the opportunity to seal over a bare metal surface first - there's no way of ensuring that all surfaces are covered with primer (on a seal/join) whereas if you are through with the seal application you should be able to make the join waterproof - but then i'm no pro either
 
vivnap said:
while working at a body shop we used to apply the seam sealer to the bare metal then prime over that. if you prime the metal first it can allow damp to penetrate the primer coat getting under the seam sealer where as cleaning the metal surface seam sealing it then priming it you are reducing the chance of moisture travel through the primer also the exposure time of the bare metal. if you apply the seam sealer with a short bristle paint brush making sure the 'seam' you are covering is well coverd this will prevent oxygen getting to the metal thus causing rust.
never use silicone based sealer as it contains chemicals that will hasten the rusting process and cause the metal to rot away very fast.
Click to expand...

am for this one
 
AS the seam sealer has no rust inhibiting propertys then you should paint the bare metat first ! i always prime it first with etch primer then seam seal the joint ON MY OWN MOTORS :D

yes i have been in the trade years,MOD trained ! well not now days more money in plant machinery lol

anyway the choice is yours ! just ask your self which makes sense ! your not bodging up a old escort ! or are you :eek:
 
mark 4x4 said:
AS the seam sealer has no rust inhibiting propertys then you should paint the bare metat first ! i always prime it first with etch primer then seam seal the joint ON MY OWN MOTORS :D

yes i have been in the trade years,MOD trained ! well not now days more money in plant machinery lol

anyway the choice is yours ! just ask your self which makes sense ! your not bodging up a old escort ! or are you :eek:
Click to expand...

acid etch primer also has no rust inhibiter either ! regardless of which you go method you go with you only need a pin prick in a painted surface for a rust spot to form, once it has taken hold it sends out 'tenticles' that will travel under anything you can put on metal and will eventually cause the breakdown of paint ect.
moisture and especially oxygen will cause the metal to rust, by sealing the bare metal you are inhibiting the process better than by priming first. moisture will penetrate any primer be it standard or etch primers and cause rust spots to form. all vehicles that come off the production line are seam sealed before any primers or paints are put on as this is the best method.
if you are going to use an etch primer the best i have used is the UPOXY 2K acid etch especially on aluminium panels.;)
 
prime the metal first but if possible use an etch primer on the welds first then prinmer all when dry...use your sealer with a stiff bristle brush soaked in thinners / spirit wipe as this will smooth the sealer out....any more advice then pm me.......proffesionel spray painter for 30 years:eek:
 
thanks for your replies, folks - it is steel - either Zintec or galvanised steel sheet.

I am using PE sealer. If it sticks half as well to the paint/metal as it does to my hands/clothes, its pretty good stuff. What is the thinner for Polyurethane sealer - white spirit wont touch it, neither will hammerite thinners? At the mo I am walking round with hands like an advert for the black&white minstrel show :eek:. that is apart from the welding burns and the grinder gouges :mad:

:cheer2: :cheer2: to all that have replied, albeit opinion is divided. I have decided to primer first, with Hammerite "special metal primer", so that it can be "sucked" into the joints. All weld joints have a weld thro primer between the faces anyway. After sealing, I am putting two coats of Hammerite, before Body Schultz and waxoyl, in appropriate areas.
 
hehehe you can chuck it on cats and set em on fire ! you would be supprised the things you can use thinners for and how quick you get through it. its brill for degreasing things but it is highly flammable and evaporates quickly. ;)
 
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