Clear Coat Disaster...

Talk Composites - The Forum for Advanced Composites

Back

Clear Coat Disaster...

Author	Message
fibernoob	fibernoob posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 34, Visits: 134	Sure ... it also didn’t add up. I changed the clear as a last resort since I had redone all the rest. Before applying to the carbon we tested on metal and interestingly enough the one that least stuck do the carbon had a better result on metal and vice-Versa. On pure resin (left over from infusion) both stuck perfectly. So I then blamed the release agent. To make sure ..... I made a quick sheet and added both wax based and pvc release agent to test.(possible release agent in the fiber opening clear) The newer clear seemed to perform better again. My only guess would be possible better chemical compatibility between them ... Thanks for the reply ... I will keep testing.
	Reply Like 2
fibernoob	fibernoob posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 34, Visits: 134	Sherwin Williams 2k automotive clear
	Reply Like 7
Hanaldo	Hanaldo posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	Doesn't make too much sense though... There's no reason one clear coat would adhere and another one would not. It is certainly possible that one would 'hide' the defects better, ie. a high solids clear would be less susceptible to opening up than a medium or low solids clear. But the issue is still there underneath. If it's sorted then great! Just be wary that you haven't just found a bandaid solution that will become a bigger problem in a couple of years.
	Reply Like 7
Interloper393	Interloper393 posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 90, Visits: 634	+x fibernoob - 11/24/2017 1:59:03 PM Thanks all for the replies. After some costly and tedious trial and error, we have confirmed that the clear coat had to be changed. After changing to another brand , the clear is sticking to the part perfectly and has shown no opening effects experienced with the previous brand of clear. What brNd did you use?
	Reply Like 8
fibernoob	fibernoob posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 34, Visits: 134	Thanks all for the replies. After some costly and tedious trial and error, we have confirmed that the clear coat had to be changed. After changing to another brand , the clear is sticking to the part perfectly and has shown no opening effects experienced with the previous brand of clear.
	Reply Like 7
MarkMK	MarkMK posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 338, Visits: 2K	Additionally, it sounds like your clear-coat is fish-eyeing...is this what you mean by it 'opening-up' which might suggest that there's some reaction with whatever you're cleaning the part with If there's a suitable product available where you are, you might have better success using an in-mould coating prior to making your parts where the spraying technique required isn't quite so critical
	Reply Like 7
Hanaldo	Hanaldo posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	It does sound like pinholes, which is a sign that the infusion wasn't perfect. What is your surface prep process?
	Reply Like 7
Interloper393	Interloper393 posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 90, Visits: 634	+x fibernoob - 11/22/2017 11:39:05 PM +x Interloper393 - 11/22/2017 10:55:17 PM +x fibernoob - 11/22/2017 9:29:34 PM Hi all. After some attempts I have successfully made a resin infused part and learn t the hard way with the many costly mistakes. However I am having great difficulty with the clear coat stage. The clear coat seems to just open many holes and give a nasty irregular (big orange peel like) finishing and has damaged all my attempts. I had initially suspected it to be release agent in the part expelling the clear coat since the first part came out with a matt finish (due to excessive and unpolished release agent). During the next attempts I used less release agent and polished the mold thoroughly leaving it with high gloss finish. The part seemed to come out OK … but since the part will be exposed to sunlight I opted to get it clear coated. I also thought it would give the part more depth and a higher quality look and avoid yellowing in future. We have tried various clear coating methods but it always just opens up many holes again and again… Has anyone experienced this before ? Help would be greatly appreciated. Method : Resin Infusion Process Resin : Huntsman High Viscosity Epoxy Resin Release agent : Huntsman Renlease QZ5111 Clearcoat : Automive PU Clear / PPG ACS Pin holes is common with clear onto epoxy. You need to do it s few times and sand it with 400grit between coats. , final coat sand with 800 and then clearcoat. Orange peel is more likely your mix and spray gun setup Thanks for the reply... Do you mean i need to clear coat and sand a few times ? Its not exactly orange peel .. its the clear coat opening up into uncovered areas Yeah when your parts out the mould, 400grit sand it and degree's it. Apply few lite coats of clear, like mist coats. Give 10 minuit between coats and then do a few heavy coats. Let it dry and check the finish. If there' pinholes repeat the above sets. Sometimes I need to do it about 3 times.
	Reply Like 8
fibernoob	fibernoob posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 34, Visits: 134	+x Interloper393 - 11/22/2017 10:55:17 PM +x fibernoob - 11/22/2017 9:29:34 PM Hi all. After some attempts I have successfully made a resin infused part and learn t the hard way with the many costly mistakes. However I am having great difficulty with the clear coat stage. The clear coat seems to just open many holes and give a nasty irregular (big orange peel like) finishing and has damaged all my attempts. I had initially suspected it to be release agent in the part expelling the clear coat since the first part came out with a matt finish (due to excessive and unpolished release agent). During the next attempts I used less release agent and polished the mold thoroughly leaving it with high gloss finish. The part seemed to come out OK … but since the part will be exposed to sunlight I opted to get it clear coated. I also thought it would give the part more depth and a higher quality look and avoid yellowing in future. We have tried various clear coating methods but it always just opens up many holes again and again… Has anyone experienced this before ? Help would be greatly appreciated. Method : Resin Infusion Process Resin : Huntsman High Viscosity Epoxy Resin Release agent : Huntsman Renlease QZ5111 Clearcoat : Automive PU Clear / PPG ACS Pin holes is common with clear onto epoxy. You need to do it s few times and sand it with 400grit between coats. , final coat sand with 800 and then clearcoat. Orange peel is more likely your mix and spray gun setup Thanks for the reply... Do you mean i need to clear coat and sand a few times ? Its not exactly orange peel .. its the clear coat opening up into uncovered areas Edited 8 Years Ago by fibernoob
	Reply Like 7
Interloper393	Interloper393 posted 8 Years Ago HOT Post Details
Group: Forum Members Posts: 90, Visits: 634	+x fibernoob - 11/22/2017 9:29:34 PM Hi all. After some attempts I have successfully made a resin infused part and learn t the hard way with the many costly mistakes. However I am having great difficulty with the clear coat stage. The clear coat seems to just open many holes and give a nasty irregular (big orange peel like) finishing and has damaged all my attempts. I had initially suspected it to be release agent in the part expelling the clear coat since the first part came out with a matt finish (due to excessive and unpolished release agent). During the next attempts I used less release agent and polished the mold thoroughly leaving it with high gloss finish. The part seemed to come out OK … but since the part will be exposed to sunlight I opted to get it clear coated. I also thought it would give the part more depth and a higher quality look and avoid yellowing in future. We have tried various clear coating methods but it always just opens up many holes again and again… Has anyone experienced this before ? Help would be greatly appreciated. Method : Resin Infusion Process Resin : Huntsman High Viscosity Epoxy Resin Release agent : Huntsman Renlease QZ5111 Clearcoat : Automive PU Clear / PPG ACS Pin holes is common with clear onto epoxy. You need to do it s few times and sand it with 400grit between coats. , final coat sand with 800 and then clearcoat. Orange peel is more likely your mix and spray gun setup
	Reply Like 6