8 replies to this topic

[clovus]

I'm halfway through a bare metal resto on my 1966 mk 1 and have had some bad luck. I etch primed yesterday but didn't get any primer on. I woke to rainy and windy weather today. After the wind died down I decided I should try spray the primer coat to stop any rust forming. Halfway through it started raining and the wind picked up blowing some onto the panels as I was spraying, forming some little water bubbles.

I know I probably should've waited for a sunny day, but I live in a coastal area and didn't want any rust forming on my freshly prepared panels. Can I just keep going with the hi fill primer if I let it dry out, or should I sand it back to bare metal again. I'm using acrylic primer if it makes any difference.

Cheers for any advice.

Edited by clovus, 24 December 2010 - 09:55 AM.

[jcsmarttec]

Don't worrie about it. Just wait till it's dry and flat it with 1500 grit wet and dry. It will be fine.

[jack_marshall]

My opinion (and experience) is you run a risk of microblistering once painted. Although you will not notice this until the temperatures are very cold and the water freezes or the temperatures are very hot and it tries to boil.

If your looking for a finish that lasts, I would strip it and start again. Its not ideal to be doing the prep outside really but if thats all you have..

[panelbeaterpeter]

So long as the rain is on top and you didn't re-coat after you saw it, then let it dry and flat it back with 320, (1500 is FAR too fine) until all the marks are gone, and the water should have evaporated. Unless the car is outside in the sun and bone dry or in a proper booth, you'll always run the risk of micro blistering due to a slightly moisture ingress in primer coat, can't really avoid it. Just make sure it's as dry as you can get it before paint to minimise the likelyhood.

[clovus]

Thanks for the words of wisdom. Still kicking myself I didn't put a tarp up on the carport. There is no chance of the paint freezing, I have never seen snow, winter gets down to 11c on a really cold day, more likely it will boil as this is our summer.

I popped the bubbles by running my hand along the panel yesterday. Pete, should I sand back to the etch primer coat?

[panelbeaterpeter]

Who needs a spray booth when you have an Australian summer! Just watch out for the flies No, just rub it back as far as you need until all trace of the water marking is gone. If you end up rubbing back through the etch primer in any area, re apply the etch in that one bit.

[clovus]

Thanks Mate,

I really appreciate the advice. We've had unseasonal rain the last few weeks, it's driving me crazy as I was really making good progress on the bodywork.

I will try and integrate a big old blowie (bluddy big fly) into a panel somewhere, just for you. Maybe it could be my own special bonnet emblem....

Cheers

Clovus

[malcs_miniturbo]

because there is bubbles now in the etch primer and you scuff them down your take the top of the bubbles and leave bare metal again like mentioned you will properly end up with micro blisters if you dont properly get rid of the bubbles. if you wet flat it down your getting the metal wet which will make it worst as the metal be rusting under you fresh paint as you say you dont want bare metal getting wet.better to dry scuff it with scuff paper and get rid of the bubbles then scotch all the shell key it all up then re do the etch all over then build up with high build primer then that be fine as i no from experience as my dad owns a paint shop in swindon and work for him.like say the biggest problem for you would be in a few weeks or so micro plisters will appers as damp wet will be soaked in the bare metal do what i said be fine unless start from scratch

[malcs_miniturbo]

because there is bubbles now in the etch primer and you scuff them down your take the top of the bubbles and leave bare metal again like mentioned you will properly end up with micro blisters if you dont properly get rid of the bubbles. if you wet flat it down your getting the metal wet which will make it worst as the metal be rusting under you fresh paint as you say you dont want bare metal getting wet.better to dry scuff it with scuff paper and get rid of the bubbles then scotch all the shell key it all up then re do the etch all over then build up with high build primer then that be fine as i no from experience as my dad owns a paint shop in swindon and work for him.like say the biggest problem for you would be in a few weeks or so micro plisters will appers as damp wet will be soaked in the bare metal do what i said be fine unless start from scratch