heat bubbles clear

[PinWerk]

ok i have a question for some of you clear guys/girls. ok i dont know what i was thinking but ive been really off the rocker lately but, so i sprayed a gun stock with some urethane clear, it all went well but then in order to bypass the chilly atmosphere i turned up the heat and put on the heat lamp over the gun stocks but DIDN'T think it was to close, but should had known but didnt n i got sidetrack with haulin cats off n etc, then came back and i have these bubbles right where the heat lamp was directin the heat.. and i know its not in the catalyst or moisture in the lines, cause i more or less was bakin that sucker on there the way i was hearin the bubbles cracklin, so i jerked them out of the room.
so to sum it all up. what to do about the bubbles from the closeness of heat lamps?
do i wait and after it dries wet sand and reclear if need to be?
which is in my head to do unless somebody has a greater idea.:snapoutofit:

[ABD]

Just a Guess Pin....I'm thinking the heat caused the top layer of clear to skim over...Underneath was still wet..The gases need to escape (flash off)...if ya stop them by creating a hardened layer..The gases form into lil bubbles and poke holes through the top layer...Commonly called solvent pop....Those are tiny pin holes....If they're big ole craters it may be another issue all together....Can't say for sure....Hope that helps a bit:)

and yes I believe you can re sand...then re clear...should fill in the holes with fresh stuff and tale care of yer prob...But again, can't say fer sure..So many variables and all:)

[redanner]

Just a Guess Pin....I'm thinking the heat caused the top layer of clear to skim over...Underneath was still wet..The gases need to escape (flash off)...if ya stop them by creating a hardened layer..The gases form into lil bubbles and poke holes through the top layer...Commonly called solvent pop....Those are tiny pin holes....If they're big ole craters it may be another issue all together....Can't say for sure....Hope that helps a bit:)

and yes I believe you can re sand...then re clear...should fill in the holes with fresh stuff and tale care of yer prob...But again, can't say fer sure..So many variables and all:)

Dell you are right on the money! Never put a heat lamp to close to fresh paint or cured paint for that matter! A good rule of thumb is to let a heat light reach full temp. Then see how close you can rest your hand from it! Keep pulling back until it is just warm to the hand not hot! Teated it like you are warming milk up for a baby! And you should not have anymore solvent popping! Another thing that can happen other popping if you trap solvents in the undercoat is to kill the topcoat gloss! If there is still thinners in the undercoat they still have to escape through the surface causing the shine to cloud or die down! I've also seen actual undercoat and topcoat wrinkle like reptile skin weeks later because of trapped thinners!

My experience with this kinda of thing was common for me because I was what was called a wet topcoat painter! I painted on the thin line of getting sags and runs to get the paint's maximum flow! For me no runs or sags, little orange peel if any! It save elbow grease but did not save time because I had to give it extra time to dry.

[PinWerk]

true so what i did early this morning was went ahead n wet sand the bubbles out and shot it with a total different urethane clear specially when i didn't have none of the other left. glad i didn't, cause i tend to favor high solid urethane clear rather than other urethane clears. so will post pics of the outcome in whits weekend show.. backed way off the heat lamps and turned out perfect .. usually dont have ot use lamps due to i go by the outside weather n wait on it.

[Stang]

Fast drying clears are the worst for solvent pops. I use PPG and 3000 clear will do that in a run. I've even had it happen in a sag. I've rarely had any luck sanding them out. Usually have to sand all the way out, seal, color and reclear. Not sure about gun stocks but I also have troubles putting a heat lamp on guitars. The base lets go. Not sure if it's moisture coming out or what the deal is but doesn't do much but create problems for me.