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| RobWilson:
Cheers Bob :beer: Hi John, For some reason, I never get good results with expanding foam. I like your idea of stuffing some foam rubber into the gap first, :thumbup: I have had to order mastic as all the local big box stores just sell silicon sealant. Rob. |
| doubleboost:
You can not beat the old methods Proper mastic sealer Shop is really taking shape now John |
| Manxmodder:
--- Quote from: RobWilson on December 31, 2016, 05:38:24 AM ---Cheers Bob :beer: Hi John, For some reason, I never get good results with expanding foam. I like your idea of stuffing some foam rubber into the gap first, :thumbup: I have had to order mastic as all the local big box stores just sell silicon sealant. Rob. --- End quote --- Trick with successful foam application is to use a proper foam gun and not the crap that's sold with a plastic nozzle on the can. The guns have a finely adjustable needle valve making it easy to get exactly the right delivery flow rate for the task in hand. Like this one,but may be cheaper alternatives on ebay....OZ. http://www.screwfix.com/p/no-nonsense-foam-applicator-gun/28483?kpid=28483&cm_mmc=Google-_-Product%20Listing%20Ads-_-Sales%20Tracking-_-sales%20tracking%20url&gclid=Cj0KEQiAy53DBRCo4en29Zvcla0BEiQAVIDcc9jKTbttFbn9zMQHz5BoGdO5cWatwPbwy4Nr6HwY7J0aAiB38P8HAQ |
| Spurry:
I think the trick with the foam, is not to try and fill a large empty void, like a gap between two walls. If you can only leave one side open and form a back to the gap (getting poetic now) for example, by closing off with some polystyrene sheet, the foam has three sides to stick to, and it seems to work so much better. Pete |
| Manxmodder:
Agree,Pete. That is definitely the way to go with any gap wider than 25mm,narrower gaps can easily be bridged by using a side to side arc movement very much like welding a stack of dimes pattern. I should also mention that excess foam that expands outside the edge of the workpiece can be pressed back into the void if you judge the setting point just right. Just takes a bit of practice and a disposable rubber glove. OZ. |
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