Hi guys, just finished welding little bits in and around the front screen. Painted it with two pack mastic stuff from that rust sorting company. Got some primer on there and some top coats, then tried to galv spray over it and one of the paints is bleeding through and causing cracking in various places. Issue number one is I tried to use up loads of old spray cans and issue number two is I reckon I've got too much paint on. If I rub the cracks out, is there a blocker or bleed proof primer that I can spray over this ? Ozziedog,,,,,,,,,,,,,It looked like a five minute job too
It sounds like the galv spray is reacting with something, either the mastic or top coat. Sand it all back, clean it with panel wipe to get rid of any oily residue & traffic film. Then only use the correct primer for the top coat you are using nothing else. Give it a couple of light dust coats (couple of passes only) leave at least 15 mins between each, then you can apply slightly thicker coats or more passes (remember to wait between coats). A final "wet" coat will leave it gun finish even from a tin on a small patch but don't go mad, you don't want the runs!! Be patient & the results will be worth it.
Yeah, taking it back makes sense to me. You could try rubbing the cracks out, then letting it all cure properly, perhaps a bit of warmth to speed up the process. Then try top coat again, but you might still end up cutting it all back.
Lol I’ve got loads and loads of patience while I’m looking at it and working my way up to doing it, then once I’ve started, I just wanna get it done. Both of your replies make complete sense to me and you’ve both reinforced exactly what I was thinking. I was really hoping for someone to come up with a miracle cure or a Barr coat that actually works and don’t create further problems. Windscreen fitter is coming tomorrow afternoon, hhhmmmmm. Ozziedog,,,,,,,,,,, thanks for your help gang,
You are probably trying to do it too quickly and solvents are still coming out of the lower layers of paint - they are still drying before curing chemically if they are that kind of two pack paint rather than just pigment in solvent. Leave it for a day or two and then see if it has cured. Should see my crackle effect engine lid. Too fast between coats...
I think you all have hit the nail , too much too fast, rubbed all the cracking and rubbish out again and a few have mentioned a light but very light mist coat, leave for an hour or two then hit it again with an extra light mist coat, this should give the primer a chance to dry before the pickle comes out to play yet again. Ozziedog,,,,,,,,,,,,I am patient if it`ll hurry up
15-20 minutes will do between coats even the latter heavier ones doesn't need to be an hour. A dust coat gives the paint something to stick to so a couple of those with 20 minutes in between then leave it 20 minutes then you can apply heavier coats again with 20 minutes in between until you have built it up to a solid colour then a final heavy coat to leave it glossy but as I said earlier don't go mad or it will run.
Yes that seems to be working. Someone has mentioned that a part of the pickling is due to the surface drying before the paint underneath and etc etc. The only way this is working for me , is to mist it then go do something else so that I’m not watching the pot boil as it were. Ozziedog,,,,,,,,,, You lot, yet again,,, to the rescue !!!
