10 replies to this topic

[1963MKI]

I'm using two pack epoxy primer from MIPA paints. Applied the paint two weeks ago and I'm trying to sand it down get a key for top coat. Only thing is sanding it, it doesn't "dust" it forms little waxy bits. The weather has been cold but i've tried to keep the area hot as possible when I was spraying and for the first 24 hours afterwards. Its particularly bad at one point in the car, where I did have issues with too much solvent. Any ideas on the issue or insights ? or is this regular with this brand of paint. I suspect not haha.

[Ben_O]

I assume you mixed enough hardener?

[absx2]

Sounds like not enough hardener or the wrong type supplied ( been there ) or the wrong ratio mixed.

[1963MKI]

yeah im pretty sure I mixed the right ratio. If it is the case ,that it has not properly hardened, due to incorrect hardener ratio. Should it not harden eventually. As i understand it, the hardener is merely a catalyst ? 

[Ben_O]

Check the mixing ratio for the paint and see if you did it right. The Epoxy I use is mixed 5:2.5, the surfacer is 6:1 and the etch is 1:1 so all different.

 

I often use slightly less hardener in the surfacer to increase pot life so that I can prime things up in stages without having to keep mixing primer and ending up with waste and it still always hardens fine.

Like has been said, make sure the hardener is the correct one for the primer.

 

Does the primer feel soft if you press the edge of your finger nail into it and what are you sanding it with

[nick@dunsdale]

Epoxy primer is generally used the same as etch primer to protect the usually bare metal from the elements.

 

It is not a build primer

 

And generally speaking not used as ground goat for top coats

 

It wont block well it is only supposed to scuffed if left longer than 72 hrs

 

When applying epoxy primer you would normally only appy one or maybe two coats, then followed by a build primer or a primer surfacer

 

S

[cookie4343]

Epoxy primer is generally used the same as etch primer to protect the usually bare metal from the elements.

 

It is not a build primer

 

And generally speaking not used as ground goat for top coats

 

It wont block well it is only supposed to scuffed if left longer than 72 hrs

 

When applying epoxy primer you would normally only appy one or maybe two coats, then followed by a build primer or a primer surfacer

 

S

Watch this video from around 9.00 mins It explains the above. I use a epoxy primer with a 1.1 ratio and it can take a few days up to a week depending on temp before it sets enough to scuff with red scotch brite without clogging..

Edited by cookie4343, 16 April 2018 - 08:42 PM.

[Ben_O]

It depends on which you use.

Remember that it is available in sanding and non-sanding versions.

 

Here is the data sheet for the one I use

 

http://www.lesonal.c...imer_UK_Eng.pdf

[nick@dunsdale]

It depends on which you use.

Remember that it is available in sanding and non-sanding versions.

 

Here is the data sheet for the one I use

 

http://www.lesonal.c...imer_UK_Eng.pdf

 

 

I have used the Lesonal one, it is one of very few that state it can be directly overcoated with top coat.

 

Though it can be handy, on new panels as you dont have to sand the O.E. primer

 

But it really isnt much use as a build primer as even with three coats it is only coming in about 100 microns,  imho it doesnt  flat that nice. i have only every used it as a protection layer

 

Thinking about it even deeper lol, if it is flatted you really dont know how thin the coating has become, i think it would better  overcoated with a primer surfacer........just my opinion :)

[Ben_O]

 

It depends on which you use.

Remember that it is available in sanding and non-sanding versions.

 

Here is the data sheet for the one I use

 

http://www.lesonal.c...imer_UK_Eng.pdf

 

 

I have used the Lesonal one, it is one of very few that state it can be directly overcoated with top coat.

 

Though it can be handy, on new panels as you dont have to sand the O.E. primer

 

But it really isnt much use as a build primer as even with three coats it is only coming in about 100 microns,  imho it doesnt  flat that nice. i have only every used it as a protection layer

 

Thinking about it even deeper lol, if it is flatted you really dont know how thin the coating has become, i think it would better  overcoated with a primer surfacer........just my opinion :)

 

100% agree.

I never use it as a build surfacer.

 

I was just trying to establish what is causing the problem for the OP as It shouldn't be causing these issues unless something is wrong.

However if it is just a regular non sanding Epoxy, then it should only be scuffed before a sandable surfacer is applies as you said.

 

Cheers

 

Ben

[nick@dunsdale]

 

 

It depends on which you use.

Remember that it is available in sanding and non-sanding versions.

 

Here is the data sheet for the one I use

 

http://www.lesonal.c...imer_UK_Eng.pdf

 

 

I have used the Lesonal one, it is one of very few that state it can be directly overcoated with top coat.

 

Though it can be handy, on new panels as you dont have to sand the O.E. primer

 

But it really isnt much use as a build primer as even with three coats it is only coming in about 100 microns,  imho it doesnt  flat that nice. i have only every used it as a protection layer

 

Thinking about it even deeper lol, if it is flatted you really dont know how thin the coating has become, i think it would better  overcoated with a primer surfacer........just my opinion :)

 

100% agree.

I never use it as a build surfacer.

 

I was just trying to establish what is causing the problem for the OP as It shouldn't be causing these issues unless something is wrong.

However if it is just a regular non sanding Epoxy, then it should only be scuffed before a sandable surfacer is applies as you said.

 

Cheers

 

Ben

 

 

 

i suspect possibly over application, to much material and not fully cured