Practically Classics Forum

Thanks Terry you can do all my pics in future!!!

I think this problem is more to do with the primer than the paint.

Celly is very fussy about what lies beneath it and whilst there is a possibility that there has been some surface contamination of the primer I think it most likely that primer and paint are incompatible.

could be, but both primer and top coat were cellulose bought from the same paint factors at the same time,a week was left between primer and top coat application then a further week untill using the upol333.The reaction started within about half an hour of the upol333 polishing,could be a coincidence but I don't think so.Anyway I went back to bare metal yesterday and primed it today,I'm going to leave well alone for a couple of weeks and see what happens before I give it a top coat.Just a thought but could it be something to do with the heat generated by the oscilating polisher?I'm no spraying expert but having said that I've been doing it for quite a few years to a fairly good standard considering I don't have a spraybooth and this has never happened before, the only difference this time being the electric polisher ,every other time I did it by hand.

Sorry I did post a reply earlier, but it seems to have vanished into the ether.

Anyhow, this may just be a result of being overheated by your polisher.

A silicone reaction would usually appear immediately and be eitehr fish eyes or splitting. Cracking or crazing is normall down to too much paint, which might be over the years or in one hit. The problem is actually down to solvet being trapped.

If as you say the paint held up until it was mopped, then over enthusiastic use of the polisher would explain cracking now.

i tend to agree with with the last post , solvent trap will cause this as will shrinkage of the primer , this used to happen a lot when yellow spray putty was applied to thickly and after a time it would shrink taking the paint with it ,

So I should bin the polisher then?

Use the polisher by all means, but dont press so hard and keep it moving. I tend to spray a little water onto the panel but this is very messy and obviously water and electrical machinery!!!

Flat the job with 1200 or 1500 and hand buff it with a medium compound then do it again with a fine one such as 3Mfinesse. Dont rely on the mop tio do the cutting for you. - Use it to get a gloss.