C2 PAINT BLISTERING

[Rob A.]

I am looking at '66 roadster that has some paint blisters, or bubbles in a few areas. I wouldn't mind a some nicks or chips from normal wear and tear, but I was wondering what whould cause the blisters to appear. My concers is that more areas might appear in the future if they are caused by not preparing or removing the previous paint properly. What typically causes this blistering?

[Bob R.]

Re: C2 PAINT BLISTERING

I had blisters on my 63. When I repainted found several layers of old paint under and the surface paint did not adhear to the lower layers of paint. The blisters got worse when the car was left in the sun. The sun must make the air expand increasing the size of the blisters.

[Steven S.]

Re: C2 PAINT BLISTERING

Where are the blister? On an air car, you sometimes see blisters on the hood where the air conditioning unit is. You can also see some in the widnshield area above the master cylinder which can idicate a leak that is wicking up through the fiberglass. If in other areas, the previous message is a possibility.

Steve

[Rich G.]

Re: C2 PAINT BLISTERING

My 66 had a couple on the fenders when I bought it. It had recently been painted by the previous owner. It is now 3 years later and no more have popped up. I fixed the 2 I had by sticking a pin in them and working them down in the presence of an ice cube. They were about the size of a 50 cent piece.

Rich Giannotti

[Stephen W.]

Re: C2 PAINT BLISTERING

Several types of blisters can happen from various comtaminents. The two primary causes are trapped solvents or trapped moisture. The sun can actually cause the moisture to form steam on a hot day to force the paint up. Big blisters sounds like some nasty solvent or contamination under the paint. At any rate its nothing a good media blast or paint stripper can't fix. Some blisters take a long time to show up because the paint was still fresh enough to breath for a period of time. As the paint aged and cured it no longer allowed the solvents to excape through the finish. When this happened what was trapped stayed under the paint film and collected in a droplet. Let the strong rays of the sun start heating them and they expand to form the blister.

[Stephen W.]

Re: C2 PAINT BLISTERING

Several types of blisters can happen from various comtaminents. The two primary causes are trapped solvents or trapped moisture. The sun can actually cause the moisture to form steam on a hot day to force the paint up. Big blisters sounds like some nasty solvent or contamination under the paint. At any rate its nothing a good media blast or paint stripper can't fix. Some blisters take a long time to show up because the paint was still fresh enough to breath for a period of time. As the paint aged and cured it no longer allowed the solvents to excape through the finish. When this happened what was trapped stayed under the paint film and collected in a droplet. Let the strong rays of the sun start heating them and they expand to form the blister.

[Ray C.]

Re: C2 PAINT BLISTERING

I had blisters where the fiberglass was repaired with resin and glass fibers. There were air pockets in the repairs. The gasses escaped from the pocket and caused the bubbles. Bubbles were the size of a dime.

Ray

[Ray C.]

Re: C2 PAINT BLISTERING

I had blisters where the fiberglass was repaired with resin and glass fibers. There were air pockets in the repairs. The gasses escaped from the pocket and caused the bubbles. Bubbles were the size of a dime.

Ray

[Stephen W.]

Re: C2 PAINT BLISTERING

Whenever you use fiberglass mat , cloth or loose chopped strands the resin must be worked through the glass for total saturation. I would use wax paper and roll it out so it would force the air out of the glass strands. If you do not achieve full saturation the glass strands will act as a wick when primers are applied. The will not draw in the solids from the primer but will wick up the solvents. This will then remain trapped within the strands of glass until they eventually excape. once the topcoats have cured enough to prevent the solvent from excaping they will collect under the topcoat till they finally are able to form that nasty blister.

[Stephen W.]

Re: C2 PAINT BLISTERING

Whenever you use fiberglass mat , cloth or loose chopped strands the resin must be worked through the glass for total saturation. I would use wax paper and roll it out so it would force the air out of the glass strands. If you do not achieve full saturation the glass strands will act as a wick when primers are applied. The will not draw in the solids from the primer but will wick up the solvents. This will then remain trapped within the strands of glass until they eventually excape. once the topcoats have cured enough to prevent the solvent from excaping they will collect under the topcoat till they finally are able to form that nasty blister.