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-   -   Help!!!! Primer wont stick (http://www.hotrodders.com/forum/help-primer-wont-stick-585.html)

Stangpwr71 11-22-2002 05:38 PM

Help!!!! Primer wont stick
 
I am in the process of duing bodywork on my car and when i get done i cover everything up with a self etching and sealing primer but it wont stick at all it looks like the primer itself is shrinking, if any body has any idea help me, the rain has started and i need to get the bare metal covered up quik thanks guys
:confused: <img src="graemlins/crash.gif" border="0" alt="[crash]" /> :(

Halloweenking 11-22-2002 07:32 PM

Is the surface clean? Whats the tempreture your spraying in? Whats the temp. of the surface being sprayed on? Is the surface scuffed? Are the primer(s) properly mixed with the correct additives if any are to be added? :confused:

HK

Kevin45 11-23-2002 09:49 AM

Hallow hit the nail on the head. You have to have the area to be primed scuffed up. The primer needs some teeth to bite into. The metal cannot be cold. The area must have NO wax or grease what-so-ever. Use a good wax and grease cleaner such as in prep-sol to clean it. If the primer is shrinking either you have wax or grease and it is seperating from it, or you have the primer mixed incorrectly. Check the directions, they are printed on there for a reason.

Kevin

TurboS10 11-23-2002 11:16 AM

Kevin, the self etching primer I have used will stick with no scuffing. I would bet there is some wax or improper mixing.

Chris

Stangpwr71 11-23-2002 01:24 PM

I have scuffed the surface with 80grit paper, i cleened it with prepsol and air temp is about 60degrees and surface temp was probably 50-55?
i guess my main prob was the temp right?
<img src="graemlins/drunk.gif" border="0" alt="[drunk]" /> <img src="graemlins/crash.gif" border="0" alt="[crash]" />

paintman1 11-23-2002 01:25 PM

etch primer should be used only for bare metal. It has an acid in it that does a couple of things. Helps it adhere to the bare metal and helps to get rid of rust that has started(normally a few seconds after metal is exposed to air rust has already started) and to prevent it from starting. The other guys are right and that you must have the right temperature, surface must be clean and the product must be mixed correctly. As far as a primer sealer, I would use a primer surfacer which is typical primer for filling in bodywork. If the car has other layers of paint the primer you are putting on could be reacting with those layers and cause the primer to "lift". This can look like small shrinking. You might have to sand that all out and apply the primer in lighter coats or strip off all the layers of paint.

Stangpwr71 11-23-2002 01:39 PM

Also the surface has been completely stripped down to bare metal
<img src="graemlins/crash.gif" border="0" alt="[crash]" />

TurboS10 11-23-2002 01:43 PM

[quote]Originally posted by paintman1:
<strong>etch primer should be used only for bare metal. It has an acid in it that does a couple of things. Helps it adhere to the bare metal and helps to get rid of rust that has started(normally a few seconds after metal is exposed to air rust has already started) and to prevent it from starting. The other guys are right and that you must have the right temperature, surface must be clean and the product must be mixed correctly. As far as a primer sealer, I would use a primer surfacer which is typical primer for filling in bodywork. If the car has other layers of paint the primer you are putting on could be reacting with those layers and cause the primer to "lift". This can look like small shrinking. You might have to sand that all out and apply the primer in lighter coats or strip off all the layers of paint.</strong><hr></blockquote>

I am betting you hit the name on the head. As soon as I read it that sounded like exactly what is going on. I have used self etching to cover a small breakthrough to bare metal when finish sanding primer and have seen it react with old paint at the feather area of the breakthrough.

Chris


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