Letters to the Editor

You are using the wrong primer or you are not using any. Generally this is caused by volatiles escaping to the surface - painting too soon.

    Hersh

Hi there,

Just read the article on bubbling paint work on a SP250, I might be able to help.

I too own a SP250 and know Esmomd Tearle.

I was talking to a guy who just had the same problem as the letter which has been sent into you. He said,the body needed to be dehumidified, or dried out for at least a week before spraying. What happens is very small droplets of water get into and down the fibres of the glass bodywork. With this done he then resprayed the body and bingo, no trouble since.

This might only be a pointer but some thing to think about.

Good luck,
    Simon Billingham

    Rodger

This sounds like micro blisters and is caused by water in your air supply or spraying onto primer when flatted wet.

Solutions put a water trap device in your airline to capture moisture or ensure surface is thoroughly dry after flatting.

Spraying when air is moist especialy with celllulose paint can cause these microblisters.

    John

When you spray a car it is very important that the car is completely dry before spraying as any moisture, both on the car and in the air, can get trapped below the paint and can appear even years later as small bubbles of water under the paint. This usually happens after a cold damp day in the winter. It is also good practice to put a water trap in the hose to the spray gun to also help remove water. When spraying I always choose a very warm day to spray and also I make sure the car has been left out in the direct sun for at least 1/2 a day before painting as this will dry out any trapped moisture.

I hope this helps.

Regards,
    Nige

I think you may have release agent/oil/trapped in gel coat and must thoroughly degrease first.

Alternatively was your car sprayed with"synthetic" at some stage? Try an isolating coat of paint first.

Lastly I thought you were meant to etch prime grp first (check with paint rep).

Regards,
    Ernie

If these take the form of micro pin like blisters these are caused by water in the airline or spraying the topcoat after flatting the primer wet. Primer should be flatted dry.

If the blisters are large this is bad preperation and caused by non adhesion of the paint primer.

What paint are you using i.e. cellulose/base and lacquer/coach paint?

You can put paint on the top of cellulose but not the other way round. My son is a car sprayer by trade and if you have further queries contact me (via this site) and I will pass them on to him.

Regards,
    John